Mathematics Middle School

In a certain​ chemical, the ratio of zinc to copper is 4 to 15. A jar of the chemical contains 375 grams of copper. How many grams of zinc does it​ contain?

Answers

Answer 1

Answer: 93 grams Zinc

Step-by-step explanation:

3 Zinc : 13 Copper

x 31       x 31            

93 Zinc,     403 Copper

or

set up a proportion, cross multiply, and solve for the variable:

3(403) = 13(x)

3(31) = x

93 = x

Answer 2

Answer:

100 Grams of Zinc

Step-by-step explanation:

15 divided by 4 is 3.75.

375 divided by 3.75 is 100.

100 grams Zinc.

Related Questions

A trendline passes through the ordered pairs (9, 12) and (12, 17). What is the slope?

Question 6 options:

3/5


5/3


-3/5


-5/3
The following trendline equation predicts the retail cost, y, of a particular wireless headset x months after its initial release.

y = -15x + 180

What is the predicted retail cost, to the nearest dollar, 3 months after the initial release?



Question 9 options:

$120


$12


$135


None of these

Question 10 (2 points)
An economist creates a scatter plot comparing years of experience to yearly salary (in dollars) at a particular company. The trend line through the data can be described by the equation y = 9,000x + 25,000.

What is the slope and what does it mean?

Question 10 options:

9,000; For their every year of experience an employee has, their salary goes up by this amount.


25,000; For their every year of experience an employee has, their salary goes up by this amount.


25,000; Regardless of how much experience an employee has, this is the minimum amount the employee will earn at this company.


9,000; Regardless of how much experience an employee has, this is the minimum amount the employee will earn at this company.

Answers

Answer:

Question 6: The slope is 5/3 because the y-intercpet is your rise and it rose up 5 units and x-intercept is your run so it shifted 3 units to the right which means the whole thing is also positive.

Question 9: $135

Question 10: Its either the first or last option

Step-by-step explanation:

Answer:

The answer for question 6 would be 5/3

and for question 9 the answer would be 135

and I believe question 10 is 9,000; For their every year of experience an employee has, their salary goes up by this amount.

Step-by-step explanation:

Slope (also can be called rate of change) is solved by change in the y variable/change in the x variable or also known as rise/run

hope this helped! :)

Oscar has a $2,500 balance on his credit card that accumulates 14.5% interest compounded annually. Which of the following could be used to find the balance on the card after 5 years?


A. A = 2500(1 + 0.145)5

A. , A... equals... 2,500... 1 plus 0 point 1 4 5 to the 5th power,


B. A = 2500 × 0.145 × 5

B. , , A.... equals... 2,500 times 0 point 1 4 5 times 5, ,


C. A = 2500(1 + 0.05)14.5

C. , , A... equals... 2,500.... 1 plus 0 point 0 5 to the 14 point 5 power, ,

D. A = 0.145(1 + 2500)5

Answers

Answer:

a

Step-by-step explanation:

2500 x 1 = 2500

2500 x .145 = 362.5

2500 + 362.5 = 2,862.5

2,862.5 x 5 = 14,312.5

Please help with math ASAP, will give brainliest!!

Answers

Answer:

1. i think is a

2. g

3. a

4. i

5. c

6. h

7. b

8. f

Step-by-step explanation:

it’s a i just did it and i got it right

Which ordered pairs are made using the corresponding terms of these two sequences, using the Sequence 1 terms first?
Sequence 1: 0, 1, 2, 3, 4, 5…
Sequence 2: 0, 3, 6, 9, 12, 15…

Answers

Answer:

The third option

Step-by-step explanation:

X coordinates are going up by 1 and Y coordinates are going up by  3

:)

Answer:

the third option

Step-by-step explanation:

I am different

Tommy walks at a rate of 2 feet per minute.

Right now, he is at -60 feet.

Where was Tommy minutes ago?

Answers

Tommy was 2 x t(number of minutes)

Guys plz help asap i need all work too i need this by midnight. DON'T ANSWER IF YOU DONT KNOW. AND COMMENT YOUR QUESTIONS SO OTHER PEOPLE CAN ANSWER. 20 points if brainliest and i will give brainliest to first person with correct answers AND WORK.

Answers

Answer:

#10.

Step-by-step explanation:

Remove the radical and raise each side of the index of the radical, y=0

#10 it’s what the other person said I don’t feel like typing it lol

1. Factor to write an equivalent expression -9x + 15y
2.Expand to write an equivalent expression -5(7m - 2)

Answers

Answer:

1.9x+-15y

2.-7 7m

Step-by-step explanation:

maybe i think it might be right

1. -3(3x-5y)
2. Y=-5(7m-2)

Solve this please! Also fill in the blanks

Answers

x, 14, 2x - 16 is greater than or equal to 12, 12, add 16 to both sides, divide both sides by 2, x is greater than or equal to 14. each box filled in is represented by the commas in between each phrase. I don’t know the rest but I did get the first part.

What is the minimum value of this Plot

I will give brainlyest to the first question

Answers

Answer:

42

Step-by-step explanation:

Please mark me BRAINLIEST

Answer:

The minimum value is 36.

Step-by-step explanation:

The line coming off the box extends all the way to 36 on the left.

How are percents, fractions, and ratios related?

Answers

Answer:

They are all portions of something, and never whole numbers.

Which expression represents the total number of apples eaten by these students in one week?

Answers

Answer:

1 + 2 + 3 = 6.       X=6

Step-by-step explanation:

Painting:
Lisa is painting a fence that is 26 feet long and 7 feet tall. A gallon of paint will cover 350 square feet. Write and solve a proportion to determine how many gallons of paint Lisa will need


(Also can you explain how you solved it? Just in case I've been doing all the other ones wrong)

Answers

Answer:

Step-by-step explanation:

First we need to find the area of the fence, since paint covers square feet and squared units refers to area.  The area of the fence is 26 x 7, which is 182 sq ft.  If one gallon of paint will cover 350 sq ft, your proportion will look like this, with gallons of paint on top and square feet on the bottom. 1/350 = x/182  Cross multiply to get 350x = 182 and x = .52, just a bit over a half of a gallon of paint.

A gallon of paint with cover 365

PLEASE HELP WITH MY MATH ASAP

Answers

Answer:

(x, y) = (no solutions, 0)

Step-by-step explanation:

2x - 4y = -10

2x + y = 10

(2x - 4y) - (2x + y) = -10 + 10

-3y = 0

y = 0

x has no solutions.

A bag contains lettered tiles. The theoretical probability of choosing a vowel is 30%. The bag contains 42 consonants. How many tiles are in the bag?

Answers

12.6 tiles i think but im not sure

Answer:

12.6?

Step-by-step explanation:

42 * 30% = 12.6

Which ratio is greater, 4:5 or 3:4?

Answers

4:5
explanation-

Express the given ratios as fraction

4 : 5 = 4/5 and 2 : 3 =2/3

Now find the L.C.M (least common multiple) of 5 and 3

The L.C.M (least common multiple) of 5 and 3 is 15.

Making the denominator of each fraction equal to 15, we have

4/5 = (4 ×3)/(5 ×3) = 12/15 and 2/3 = (2 ×5)/(3 ×5) = 10/15

Clearly, 12 > 10

Now, 12/15 > 10/15

Therefore, 4 : 5 > 2 : 3.

Answer:

4:5

Step-by-step explanation:

PLZ help (SLOPE) 10 pts

Answers

I don’t really know how to do this but the slope of 10 is gonna be
I’m pretty sure the slope is 10

please help if you know how to do it! I have to turn it in by the end of the day and I just need to know there's three to get started!

The equation |x| = 100 has two solutions. x = -100 and x = 100 Write two solutions for each variable in the equations
a = 7 a = __________ and a = __________
p = 41 p = __________ and p = __________
y = 256 y = __________ and y = __________

Answers

I think you meant |a|=7, |p|=41, and |y|=256. In that case, a=7 or -7, p= 41 or -41, and y=256 or -256.

HELP NOW PLS!!!
answer choices
20 m3
14m3
20m2
14m2

Answers

Answer:

20m2

Step-by-step explanation: Trust me I have This question and it is really easy!

Answer:

It 20m2

Step-by-step explanation:

Hope it was helpful

pls look at the image and answer quickly!

Answers

Answer:

6

Step-by-step explanation:

The answer should be 6 I’m not sure

Simplify the expression:
3j+10j

Answers

Answer:

13j

Step-by-step explanation:

3+10=13

Answer: 13j

Step-by-step explanation: 3j+10j=13j

Please help due today {Mark brainlist} 100 points

Answers

This is the first section
1. x = 5
2. x = -8
3. x= -1
4. x= 9
5. x= -7
6. x= -11
7. x= -6
8. x= -3
9. x= -5
10. x= 8
11. x= 3
12. x= -4
Hope this helped!
Is there any other worksheets you got for this?

Help me fast, and get a lot of points!!!

Answers

The answer is subtract two from both sides. Explanation: because it males the equation even and easier to solve.

Answer:

[tex] \underline{ \underline{ \boxed{ \text{Subtract \: 2 \: from \: both \: sides}}}}[/tex]

Step-by-step explanation:

Since we want constants only on the right hand side , we have to remove 2 which is on the left hand side. The opposite of +2 is -2 and whatever we do to one side , we must do to the other side. So, The first step that would be used to solve the equation should be Subtract 2 from both sides.

Hope I helped ! ♡

Have a wonderful day / night ! ツ

# [tex] \underbrace{ \text{Carry \: On \: Learning}}[/tex] !!✎

▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁

20 points, Brainliest, thanks and 5 stars.
What is the value of the expression shown below?
10 + (2 x 3) to the power of 2 ÷ 4 × 1/2 to the power of 3

11 and 1/8
25 and 1/6
69
82

Answers

11 1/8
Explanation
The answer comes out to 11.125 however in mixed number form it’s 11 1/8

Answer:

11 and 1/8

Step-by-step explanation:

We can do this in the format of PEMDAS

Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction

10 + (2 × 3[tex])^{2}[/tex] ÷ 4 × [tex]\frac{1}{2} ^{3}[/tex]

Let's do the parenthesis first

10 + [tex]6^{2}[/tex] ÷ 4 × [tex]\frac{1}{2} ^{3}[/tex]

Now we can do the fraction with the exponent second

10 + [tex]6^{2}[/tex] ÷ 4 ×  [tex]\frac{1}{8}[/tex]

Now we can do the other exponent

10 + 36 ÷ 4 × [tex]\frac{1}{8}[/tex]

Now we can divide the 36 and 4

10 + 9 × [tex]\frac{1}{8}[/tex]

Now we can multiply the 9 and  [tex]\frac{1}{8}[/tex]

10 + [tex]\frac{9}{8}[/tex]

And we can convert the improper fraction to a mixed number

10 + 1 1/8

And now we can add them up, the 2 whole numbers and the fraction stays the same

11 1/8

Hope this helped!

Have a supercalifragilisticexpialidocious day!

please help me on this for brainliest

Answers

Answer:

B

Step-by-step explanation:

Will give branliest!! Please answer!

Answers

the area is 32 inches.

area = height x width.

8 x 4 = 32.

Answer:

your area is 32

Step-by-step explanation:

What is the reciprocal of -7/9?

Answers

Pretty sure it’s -9/7
reciprocal of -7/9 is -0.01587301587

HELPPPP PLSSS ILL GIVE U 40 POINTSSS

Answers

105

or

140

explanaion: its one of the two i believe

i’m pretty sure it’s 140

The two-way frequency table summarizes the data on movie preference and gender. Which statements are correct?

Answers

Answer:

B, C, and E should be correct.

Step-by-step explanation:

Just going by what the table says, more women participated, and overall, men preferred the action and sci-fi more than the women showing that there was a preference between the sexes.

PLZ HELP. Rima wants to learn more about the heights of the students at Spring Valley Middle School. The school teaches students in grades 6 through 8. Each subject is taught by a different teacher, so students change classrooms every period. Students don’t have a class every period, but every student has a homeroom class. Consider five samples from this population, then answer the questions that follow. Sample A: Survey four random students in each of Rima's classes. Sample B: Survey two random students from each homeroom class. Sample C: Survey three random girls from every third-period class. Sample D: Survey every sixth person in the student directory. Sample E: Survey every third person in the band directory. Part A Is sample A a random sample? Why or why not?

Answers

Answer:

PART A: Sample A is not a random sample. In a random sample, all members of the population have an equal chance of being selected. Sample A has students from Rima’s classes, but no students from other classes. Students from the other two grades in the school won’t be represented.

PART B: Sample B is a random sample. Every student, or every member of the population, has a homeroom class. All of them have an equal chance of being selected in the sample.

PART C: Sample C is not a random sample because the sample excludes boys. The sample should include both girls and boys to represent the entire student population.

PART D:  Sample D is a random sample. All students in all grades are featured in the student directory, so all of them have an equal chance of being picked for the sample.

PART E: Sample E is not a random sample because it consists of only the students in the band and excludes all other students from the sample. Because not every student is in the band, this is not a fair representation of the entire student body.

please give me brainlist thank you and have a good day :)

Answer:

PART A: Sample A is not a random sample.

PART B: Sample B is a random sample.

PART C: Sample C is not a random sample.

PART D:  Sample D is a random sample.

PART E: Sample E is not a random sample.

Step-by-step explanation:

These are the answers from Edmentum. Got them all right with this.

PLEASEEE!!!!!!! HELPPPPP!!!!!!!!

What is the value of x in the equation 7.5 = x + 2.25?
A. 9.75
B. 4.75
C. 7.25
D. 5.25

PLEASE HELP!!!!!
IL GIVE BRAINLIEST!!!!!!!!

Answers

Answer:

D. 5.25

Step-by-step explanation:

Other Questions
How did the Byzantines spread Christianity? Solve for XB. X X 152 What advantages did the states experience under thecommon market? ? included a sense of time in his photographs - showing figures and animals in motion.O a. AdamsO b. RaphaelO c. DaguerreO d. Muybridge Explain Why you would like to be a president of the United States. Make sure to write a good introduction and closing statement. I dont know what to put.... please help!! Please give me some ideas. 1.An object is released, 50m above the ground, froma hot air balloon, which is descending vertically at aspeed of 4.0m/s^2.Calculate:a.The velocity of the object at the groundb.The duration of descent of the objectc. The height of the balloon above the ground whenthe object hits the ground. Evaluate if j = 6: 3] - 10PLS HELP FAST Give A brief explanation of what your expectations are for the Spanish 2 course Find the volume of this right rectangular prism. [type your answer as a number] Can someone please help Ill mark you the brainiest What does the range switch prevent Help me please I need this grade!Which expression is equivalent to 24x + 18y?A) xy + 42 B) 6(4x + 3y)C) 6xy(4 + 3) D) 42xy whats the relationship between lichens and quality why was MLK Jr.'s "i have a dream" speech one of the best speeches in history? What is the value of x? Enter your answer in the box. Rosa enlarged an image on the copy machine. The actual measurement was 3.6 inches by 6 inches. The enlarged version is 6 inches by another measurement. What is the length of the new image? A. 4 in. B. 6 in. C. 8 in. D. 10 in. What is the distance from A(-3, 6) to B(4, -3)?\/~~32\/~~-32\/~~10\/~~130 cole is preparing for a talk on child abuse. help him finsih the sentence Solve each system of equations algebraically y=x+2y=-3x Why is it important that sulfur dioxide is not released into the atmosphere?