Mathematics Middle School

Rosa throws a ball. The equation d = −t^2 + 4t + 5 represents the path taken by Rosa's ball where d is the height of the ball (in feet) after t seconds. How long was the ball in the air?

A. 1 second
B. 4 seconds
C. 5 seconds
D. 9 seconds

Answers

Answer 1

Answer:

B

Step-by-step explanation:

-t²+4t+5=0

t²-4t-5=0

t²-5t+t-5=0

t(t-5)+1(t-5)=0

(t-5)(t+1)=0

t=5,-1

when t=0,d=5

actual time it it is in air=5-1=4 seconds.

Answer 2
If I did the math correctly, it should be B

Related Questions

How can I add ¾? Explain.

Answers

Answer:

Step-by-step explanation:

you can do many things to add 3/4, most common way si thinking of 3/4 3 quarters of your number

you can add 3/4 to 1 which is 1 3/4

1+3/4=1 3/4

or,

you could do

3/4 OF 10 is 3 quarters of 10 which is 2.5x3 or 10 -2.5 which equals,

7.5

Answer:

You can add 3/4 by adding as a decimal so 3/4 of 100 is 75 so it would be .75

Step-by-step explanation:

i need help pls help me

Answers

Answer:

the answer for a is t-10p= x

Step-by-step explanation:

t= tomatoes

p= pounds

x= leftover amount of tomatoes.

2.5x - 10 = y

x, y
ethan amt, zachary amt
2.5, 10, x, y
2.5
10

Please help me!!!
At midnight, the temperature in a city was 5 degrees Celsius. The temperature was dropping at a steady rate of 2 degrees Celsius per hour.
Write an inequality that represents t, the number of hours past midnight, when the temperature was colder than -4 degrees Celsius. Explain or show your reasoning.

2.
Tyler is simplifying the expression 6−2x+5+4x.

Here is his work:

6−2x+5+4x

(6−2)x+(5+4)x

4x+9x

13x

His work is incorrect. Explain the error he made.

3.
Simplify the expression 6−2x+5+4x. Hint: Your final expression shoul donly have two terms.

4.
Factor to write an equivalent expression:

36a−16

5.
Expand to write an equivalent expression:

−14(−8x+12y)

6.Diego's family car holds 14 gallons of fuel. Each day the car uses 0.6 gallons of fuel. A warning light comes on when the remaining fuel is 1.5 gallons or less.

Starting from a full tank, can Diego's family drive the car for 14 days without the warning light come on?

Please help me thank you

Answers

Answer:

I dont really know the answer

Step-by-step explanation:

I dont know

did you figure it out?

Pepino’s pizza charges $8 for medium pizza plus $2 for each topping. How many toppings are on a medium pizza that costs $20?

Answers

Answer:

6 toppings

Step-by-step explanation:

Find how much the toppings cost in total without the medium pizza.

20 - 8 = 12

12 ÷ 2 = 6 toppings

There would be 6 toppings on the medium pizza.

2 glasses of milk and 3 snack bars have a total of 73 carbohydrates​ (carbs), and 4 glasses of milk and 2 snack bars have a total of 86 carbs. Determine how many carbs are in one glass of milk and in one snack bar.

There are ___ carbs in one glass of milk.

Answers

Answer:

There are 14 Carbs in 1 glass of milk.

I DONNT UNDDERSTAND THIS AT ALL

Answers

Answer:

Here's exactly what I would write:

a = Sandy cupcakes, b= Sandy gummy bears, c = Sandy brownies, d = Nina cupcakes, e = Nina gummy bears, f = Nina brownies

a = 4d

b = 3e

c = 2f

Expression for Sandy: 4d + 3e + 2f

Expression for Sandy and Nina: 5d + 4e + 2f

Step-by-step explanation:

This is a terrible question that makes people feel frustrated. I'm sorry.

a = Sandy cupcakes, b= Sandy gummy bears, c = Sandy brownies,

d = Nina cupcakes, e = Nina gummy bears, f = Nina brownies

Sandy has 4 times the number of cupcakes as Nina: a = 4d

Sandy has 3 times the number of gummy bears as Nina: b = 3e

Sandy has 2 times the number of brownies as Nina: c = 2f

An expression for how many desserts Sandy is bringing: a + b + c

An expression that could be used for how many desserts Sandy and Nina are bringing together: a + b + c + d + e + f, but I think they want you to substitute the equivalent values like above (a = 4d)

Sandy: 4d + 3e + 2f

Sandy and Nina: 5d + 4e + 2f

because 4d + 3e + 2f + d + e + f = 5d + 4e + 2f

I'm sorry I don't have a simpler way to explain this. It's a painful question. I will answer any questions  you have.

Wow yes his answer is more than right thank you so much you also helped me out

The table below gives the price for different numbers of burgers. Do the numbers in the table represent a proportional relationship?

Answers

yes it does.
18/6=21/7=24/8=27/9= 3

Please explain your work, thank you!!

Answers

Answer:

ez

Step-by-step explanation:

The answer to the question is 1/12

How are convection currents in the mantle (geosphere) and in the oceans (hydrosphere) similar? Or how are they different. Explain one of the two or how their similar and different. Thanks :)
I give brainliest to whichever makes the most sense

Answers

Answer:

They are different because in the mantle, the magma is heated, it becomes less dense and rises. It give off it's thermal energy and cools down, becoming more dense and descend to be heated again.

In the ocean, the tropics warm the water and it travels to the poles to cool down, then returns to the tropics to heat up again.

they are similar in the ways that they move and create energy.

different because

PLEASE HELP... Find the area of the semicircle. Round your answer to the nearest hundredth.

THE DIAMETER IS 24 INCHES.

area: about [?] inches^2

Answers

It’s not on that file, it’s a scam
It’s not on the file so it is a scam

4. What is the area of the composite shape below?

do it step by step

Answers

Answer:

A=(L×W)

=10ft×8ft=80ft²

Step-by-step explanation:

I hope it helped. I think this is the answer.

a=(pi)(r^2)
a=(l)(w)

half-circle
a=(3.14)(4^2)
a=50.24
50.24/2 (because it half circle)
25.12

rectangle
a=(10)(8)
a=80

total area
80+25.12=105.12

105.12

Ok so I have been trying to figure this answer out but I CANT SO PLZZZZZ HELP AND NO LINKS!!!

Graph the following inequalities on a number line.
X ≥ -4

Answers

x is greater then -4 because x is just one
On a number line draw a closed circle on -4 then draw a line from it facing right

Closed circle is greater/less than or equal then the line shows if x could be doing higher or lower number

can somebody please help me and explain a little bit? :(

Answers

Median: number in middle
Arrange in lowest to highest
1, 2, 3, 3, 4, 6, 7, 8
Cross out numbers until you reach the middle two
3 and 4, what’s between them?

Solution: 3.5
The median is the middle number in a set of numbers.
For this set of numbers, the median would either be 7 or 1 because the set of numbers is uneven

HELP QUICK!
...........................
Find x.

Answers

Answer:

i think its 2 ft i’m not sure tho

Step-by-step explanation:

Answer:

The answer is 1.75.

Step-by-step explanation:

Since 3 is 1/4 of 12, you have to divide 7 by 4 to get your answer. Hope this helps

The taillight of a car is in the shape of a kite whose diagonals are both 15 centimeters. How many square centimeters does the kite occupy?

30
56.25
112.5
225

Answers

The answer is 30
Have a great day!!

An octagon has an area of 55.3 square inches. It is a smaller version of an octagon whose dimensions are 7 times larger. What is the area of the larger octagon?

Answers

9514 1404 393

Answer:

  2709.7 square inches

Step-by-step explanation:

If the linear dimensions are a factor of 7 larger, then the area is a factor of 7^2 = 49 larger.

  larger area = 49(55.3 in^2) = 2709.7 in^2

Alex is setting up an in-line skating course 21 feet long to practice weaving around cones. He wants a cone every 3 1/2 feet. How many cones does he need?​

Answers

Answer:

I think it is 6 cones

Step-by-step explanation:

21 ÷ 3.5 = 6

Plz help: what is the probability?
Rolling a number that is less than three 5 times in a row on a number cube labeled 1 through 6

Answers

Answer:

whats the options

Answer:

well to me it would be a half and half deal so you might and you might not..

Step-by-step explanation:

3x + 2 = -55 i need all the steps

Answers

Answer:

-19

Step-by-step explanation:

3x+2 = -55

   -2         -2

3x = -55-2

3x = -55+-2

3x = -57

/3      /3

x=-19

Answer:

-19

Step-by-step explanation:

[tex]3x + 2 = -55[/tex]

[tex]3x = -55[/tex]

       [tex]-2[/tex] (2 is negative because it was moved to the other side of the equation)

[tex]3x/3 = -57/3[/tex]   (Divide both sides of the equation by 3 to isolate x.)

[tex]x = -19[/tex]

no one get the answer right so i will repost this again

Answers

Answer: the rectangle is 5 and the other one is i think 135  

Step-by-step explanation:

rectangle is 5, not sure about the other inw

Are my answers correct??

Answers

Answer:

Yes, but I'm no expert.

yesss i think i’m not that smart lol

What is 2+4+6-9+17-4=x

Answers

Answer:

x = 16 or 16 = x

Step-by-step explanation:

2+4+6-9+17-4=x

6+6-9+17-4=x

12+17-9-4=x

29-9-4=x

20-4=x

16=x

Answer:

[tex]x = 16[/tex]

Step-by-step explanation:

[tex]2 + 4 + 6 = 12[/tex]

[tex]12 - 9 = 3[/tex]

[tex]3 + 17 = 20[/tex]

[tex]20 - 4 = 16[/tex]

tysm 30 points!! pls answer correctly

Answers

Answer:

The answer is 4 trust me i'm in high school.

Step-by-step explanation:

Plzz mark brainliest

4/9 kilogram of baking soda costs $2. How much does 1 kilogram of baking soda cost?

please drop an explanation, and equation thanks!

Answers

Ok so we want to cross multiply.
To do this you know 4/9=2$ so now you want to know 1=x$
When you do this you get $5

Answer:

1 kg of baking soda costs $4.50.

Step-by-step explanation:

Write and solve an equation of ratios, as follows:

 4/9 kg            $2

------------- = --------------

    1 kg               x

Multiplying both numerators by 9, we get:

  4 kg          $18

------------ = ---------

   1 kg             x

Cross-multiplying, we get 4x kg = $18-kg.  Solving for x, we get:

        $18-kg

x = -------------- = $4.50

         4kg

1 kg of baking soda costs $4.50.

Create an expression that is equivalent to 7x + 4x + x, using the fewest terms

Answers

12x cause 4+7+1 equals 12 so 12x
The answer is
11x+x
Because if you add 7x+4x it makes 11x and we can’t add the other variable

In a seventh-grade class of 28 students, there are 16 girls and 12 boys. If one student is randomly chosen to win a prize, what is the probability that a girl is chosen?

Answers

Answer:

65/100

Step-by-step explanation:

If x is 100, what is the area of the cell phone's range?
BTW, it is in feet.

Answers

3.1415926535897932384626433

H:$/1111.7733744477z !:;7;;):34.

need help with this one question

Answers

Answer:

71.6599

Step-by-step explanation:

I think if I’m wrong please tell me

wich ik I’m probably wrong

Simplify: -13 • 100

Giving Brainliest

A) 1,300
B) 13,000
C) -1,300
D) -13,000

Answers

Answer:

The right answer is option (c) -1,300

The right answer is option C) -1,300

A cylinder has a volume of 24 cubic feet. Which of the following could have the same radius and height as the cylinder?

A. A cone with a volume of 72 cubic feet
B. A cone with a volume of 32 cubic feet
C. A sphere with a volume of 18 cubic feet
D. A cone with a volume of 8 cubic feet

Answers

DO NOT OPEN THAT FILE THEY COULD BE TRYING TO HACK YOU, i've seen them send it to a lot of ppl
Other Questions
1. The coach explained that herwas to use practice to improve everyone's teamwork.O A intentOB. equalityC. guideline From the parking lot at red hill shopping center the angle of the top of the hill is about 25 from the base of the hill the angle of elevation to the top of the hill is 55 What is the fate of the sunlight during photosynthesis?A. It is released as a productB. It lowers the activation energyC. It is converted to chemical energy D. It is an unnecessary reactant Here are the boiling points of certain elements in degree Celsius:Argon: -185.8Chlorine: -34Fluorine: -252.87Krypton -153.2List the elements from least to greatest boiling points. solve the inequalities and graph the solution 7d+8>29 what does lol mean and what does lamo mean? Mention any four changes that took place recently in your society. are these numbers linear or non-linear x- 0, 1, 2, and 3 y- 1, 3, 6, and 10 NEED HELP ASAPWhich of the following increase the speed of action potentials in the nervous system? Which of the following sentences could work as a topic sentence of an example paragraph? A. I can usually eat anything, but there are a few occasions when Ihave been unable to stomach what was set before me.B. Adventurous eating is an art.C. Eating should be considered a sport, but so far the Olympics hasrefused to recognize it.O D. My mother always told me to eat my vegetables, even if I didn't likethem. Human beings are: more genetically similar than any other species. genetically diverse compared to other species. members of various species, depending on nationality. Explain how you can use proportional reasoning to determine the whole if youknow that 40 is 60% of the whole. Throughout history, many individuals have greatly influenced North Carolina. Their accomplishments, ideas, and inventions have transformed the lives of millions of people. a number is the square root of 16 and also the square root of 2. what is the number? Which expressions can be added to find the volume of the solid figure?Select all that apply. Read the passage.Ship captains do what they can to avoid turbulent weather. Rough, stormy seas can threaten ships, which is why captains avoid them and favor serene conditions.Stormy seas cannot always be avoided, however. In that case, a ships ballastheavy material that is located in the bottom of a ship and acts as a stabilizeris essential.Which context clue best helps the reader understand the meaning of turbulent?Rough, stormy seas can threaten shipsStormy seas cannot always be avoidedheavy materialacts as a stabilizer 1.Solve 17 - X = 1 + 3X Find the area of the kite Jane has 3 cups of yogurt that she wants to split into smaller containers. Each container can hold cup of yogurt. what does the choroid plexus do?