This is a review of last lesson's concept You have 2 red marbles, 3 black marbles, and 2 blue marbles. You pick a marble, look at it, and replace it in the bag Then you pick a marble again. What is the probability of picking a red marble both times?
The length of a rectangle is 5 more than the width. The area is 500 square feet. Find the length and width of the rectangle.
Answer:
length = 25ft, width = 20ft
Step-by-step explanation:
Let x= width, so length = x+5
Area = l x w so A = x(x+5)
Since the area is given as 500 sqft, your equation is x(x+5)=500.
Although the numbers are easy enough to factor in your head, mathematically the equation can be solved as a quadratic, as follows:
x^2 + 5x -500 = 0
Using either factoring or quadratic formula, x = 20 (the other value is negative). Therefore the width is 20ft and the length is 25ft.
18
Type the correct answer in each box. Use numerals Instead of words. If necessary, use / for the fraction bar(s).
The grades received by 200 students follow a normal distribution. The mean of the grades is 70%, and the standard deviation is 7%.
The number of students who received a grade greater than 70% is about
. and the number of students who got a grade higher than
84% is about
Reset
Next
Answer: 100
5
Step-by-step explanation:
a) The mean of a normal distribution is also the median. Half the population will have values above the mean. Half of 200 is 100, so ...
... 100 students will have grades above 70%.
b) 84% is 14% above the mean. Each 7% is 1 standard deviation, so 14% is 2 standard deviations above the mean. The empirical rule tells you 95% of the population is within 2 standard deviations of the mean, so about 5% of students (10 students) got grades higher than 84% or lower than 56%. The normal distribution is symmetrical, so we expect about 5 students in each range.
... about 5 students will have grades above 84%.
(I’ll give points + brainalist for the correct answer with an explanation)
Answer:
b
Step-by-step explanation:
divide 1/4 by 20
Identify like Terms
8x2 yx3 9x2 y2 5y
What is the volume of a cylinder with a height of 13.6 cm and a base with a radius of 6.6 cm, to the nearest tenth of a cubic centimeter? !!!asap
Answer:
1,861.1 cubic centimeters
Step-by-step explanation:
Volume of a cylinder is
[tex]v = \pi {r}^{2}h[/tex]
so you would plug it in and solve
[tex]v = \pi ({6.6})^{2}13.6[/tex]
PLEASE HELP I don’t know the answer and I need it fast
What equation can I use to solve for x?
What equation can I use to solve for y?
Answer:
125+9x-8=180
6x+13+6y+29=180
Step-by-step explanation:
Suppose that the middle 68% of speeding ticket fines on a highway fall between 93.18 and 118. Give an approximate estimate of the standard deviation of the speeding ticket fines. Assume the fine amount has a normal distribution
Answer:
The approximate estimate of the standard deviation of the speeding ticket fines is of 12.41.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
Approximately 68% of the measures are within 1 standard deviation of the mean.
Approximately 95% of the measures are within 2 standard deviations of the mean.
Approximately 99.7% of the measures are within 3 standard deviations of the mean.
Middle 68% of speeding ticket fines on a highway fall between 93.18 and 118.
This means that 93.18 is one standard deviation below the mean and 118 is one standard deviation above the mean. That is, the difference between 118 and 93.18 is worth two standard deviations. So
[tex]2s = 118 - 93.18[/tex]
[tex]s = \frac{(118 - 93.18)}{2}[/tex]
[tex]s = 12.41[/tex]
The approximate estimate of the standard deviation of the speeding ticket fines is of 12.41.
Which equation has x = −2 as a solution?
a
2x + 10 = 14
b
2x + 8 = 4
c
3x + 10 = 1
d
3x − 8 = 7
Answer:
B
Step-by-step explanation:
The answer is B because 2 x -2 + 8 = 4 So it matches up in that equation so answer is b
Answer:
2×+8=4
Step-by-step explanation:
hope it helps.....................
62. AAA+AA+A= 246 => A= ?
A.1 B.4 C. 2 D.5 E. 8
Answer:
C. 2
Step-by-step explanation:
222 + 22 + 2 = 246
So A = 2
Someone walked%s the length of this room
then walked backward 4 the length of this
room before walking forward / the length
of the room and hiding the key there. How
far across the room (as a fraction) is the
key? Use a "/" as a fraction bar in your
answer.
Answer:
E-e-e-e-et-t-t-o.... B-b-b-b-b-baka h-h-huh... g-g-g-g-g-g-gOmensas-s-s-sai S-senpai...
Step-by-step explanation:
uHM yeah
Helllps please help this timed please I will mark brainliest. PLz. NO LINKS OR I WILL REPORT YOU. Please give an explanation.
Answer:
please????
Step-by-step explanation:
Solve the inequality:
2x + 3 > -11
Answer:
x > − 7
Step-by-step explanation:
hope this helps
Can someone please help me with 4 and 5 ???
Answer:
4. D
A: -25.5=a
B: b=-4
C: c=12
D: d=8
Step-by-step explanation:
4.Between a and d they are the 2 bigger values but D was the greatest out of all of them. - divided by a - will result as a positive and 7/9=0.77 and 19/12 *I looked for the least common factor and multiplied numerator and denominator to 12 depending on the denominators value. Ex: since one of my denominators was 4, I multiply the whole fraction by 3 to get 9/12 and the other was 5/6 times 2 is 10/12 and just add 10/12 by 9/12 which is 19/12.
5.
A: All I did was multiply 8.5 and -3 and get -25.5=a.
B: I add 7 on both sides of the equation and -7 and 7 get canceled off and -11+7=-4. b=4.
C: I multiplied - to -3 and got 3, now I can subtract -3 on both sides. 15-3=12 so c=12.
D. I had to divide by 4 on both sides to get d by itself. 32/4=8 so final answer would be d=8.
Write sixty-five and three hundredths
a. as a decimal number
as a mixed number
Step-by-step explanation:
answer in decimal form 65.03
answer in mixed number form 65 3/100
What is the dropdown to complete the following inequality?
Answer:
1 - a > 0
Pls mark me brainliest :))
I did it right on khan so believe me
Find the missing angles in the diagrams below.
Answer:
a. 27° + (2x° + x°) = 180° (linear pair)
27° + 3x° = 180°
3x° = 180°-27°
x° = 153°/3
x° = 51°
2x° = 2×51 = 102°
b. a° = 142° (vertically opposite)
c° + a° = 180° (linear pair)
c° = 180° - 142°
c° = 38°
i° = c° = 38° (vertically opposite)
Express 72km/h in meter per sec
Answer:
20meter per second is tw correct answer
20 m/s
Step-by-step explanation:
1km/h = 1000m/3600s = 5m/18s
⇒ 72 × 5 ÷ 18 = 20 (m/s)
Write the equation of the lines which have the following parameters. Write the equation in slope intercept form.
1. slope = 3; y-intercept = 5
2. slope = 2/5; y-intercept =-10
3. slope = -3/2; y-intercept = -2
4. slope = 18; y-intercept = 0
5. slope = -3.253; y-intercept =-14.159
6. Challenge problem: x-intercept = -2; y-intercept = 6
Answer:
Step-by-step explanation:
Slope intercept form is :
y = mx + b
where m is the slope and b is the y-intercept.
So, given slope and y-intercept, all you have to do is plug in slope for m and y-intercept for b.
1.) y = 3x + 5
2.) y = 2/5x - 10
3.) y = -3/2x - 2
4.) y = 18x
5.) y = -3.253x - 14.159
For question 6, you need to calculate the slope given the two points then plug in the slope and y-intercept to get the equation.
So to find slope, you use the equation below:
slope = (y2 - y1) / (x2 - x1) = (6-0) / (0 - -2) = (6) / (2) =3
6.) y = 3x + 6
Is -2.4 and 1.5 repeating or terminating decimals?
Answer:
terminating decimals
Step-by-step explanation:
3. Suppose that a parabola has
x-intercepts (-3,0) and (2,0) and goes
through the point (-1,12). Which
quadratic function represents the parabola
in factored form?
A
y=-(2 - 3)(x + 2)
B
y= -2(x − 3)(x + 2)
Y= -2(x+3)(2 – 2)
D.
y= (2 + 1)(x - 2)
Answer:
C. I used to not get this but now I do. hope I helped
A survey found that 25% of people gave up their home phone years ago and only use a cell phone now. If 3,000 people said that they only use a cell phone now, how
many total people were surveyed?
Answer:
12000
Step-by-step explanation:
25/100 = 3000/total people surveyed
total people surveyed = 3000×100 / 25
= 12000 people surveyed
Devin has a rectangular vegetable garden. He planted tomatoes in section of the garden with an area of 6 square yards. There were 30 square yards remaining for Devin to plant zucchini. Let g represent the total area of the garden. Which equation models the problem? Solve the equation to find the total area of the garden. g =
Answer:
g=30y^2+6y^2
Step-by-step explanation:
30 years left after six were taken
PLEASE HELP THIS IS VERY IMPORTANT I'LL GIVE YOU BRAIN THING IF ITS CORRECT!! <3 NO LINKS PLEASEE.
Answer and Step-By-Step Explanation:
The point shown is marked at (36,82), meaning that the panda is 36 months old and weighs 82 kilograms. To plot the next point, just go up from 110 on the graph to 90 and mark a point. (Sorry I tried to put an image but it was extremly blurry.)
Solve the equation r - 14 = 10
6. Solve the equation m x -8 = 64
7. 3² + 1( 3³ ÷ 3)
8. What is the difference between Expression and Equation? Give example for each.
Answer:
5.)
r - 14 = 10
r = 10 + 14
r = 24
6.)
x - 8 = 64
x = 64 + 8
x = 72
7.)
3² + 1( 3³ ÷ 3)
9 + 1( 9 ÷ 3)
9 + 1(3)
9 + 3 = 12
8.)
Expression:
An expression is a number, a variable, or acombination of numbers.
e.g. 10x + 63 and 5x - 3
Equation:
An equation is made up of two expressions connected by anequal sign.
e.g. ax² + bx + c = 0
-TheUnknownScientist
Please Help!!! I will give brainliest!
Answer:
D
Step-by-step explanation:
Table a has a output set for every input, making it a function. However, table B has 2 different outputs for 1 input. Therefore, A is a function and B is not.
the width of a rectangle is 7 cm less than twice its length. its area is 30 square cm. find the dimensions
Answer:
l = 6 cm
w = 5 cm
Step-by-step explanation:
l(2l - 7) = 30
2l^2 - 7l - 30
(2l + 5)(l - 6)
l = 6
2(6) - 7 = 5
Urgent, HELP! I need this ASAP
Answer:
Y repersents 1
Step-by-step explanation:
Answer:
y= 6 z = 7.5 x = 5(1/3)
Step-by-step explanation:
the ratio from small to big multiply by 4/3
from big to small multiply by 3/4
Layla is making pizza for a pizza party each pizza requires 1/8 pound of cheese how many pounds of cheese does she need to make 10 pizzas express your answer in simplest form
10/80 pounds of cheese
1/8×10=10/80