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3 years ago

Simplify the expression 3x(x – 12x) + 3x2 – 2(x – 2)2. Which statements are true about the process and simplified product?

Mathematics

1 answer:

lora16 [44]3 years ago

6 0

Answer:

solve for x

Step-by-step explanation:

use distributed propertie and solve for x

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Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follow

guajiro [1.7K]

Answer:

a) x = 1.52

b) s = 1.16

Step-by-step explanation:

We have that:

5 students watched 0 movies.

9 students watched 1 movie.

5 students watched 2 movies.

5 students watched 3 movies.

1 student watched 4 movies.

(a) Find the sample mean x.

Sum divided by the number of students. So

$x = \frac{5*0 + 9*1 + 5*2 + 5*3 + 1*4}{5 + 9 + 5 + 5 + 1} = \frac{38}{25} = 1.52$

(b) Find the approximate sample standard deviation, s.

Standard deviation of the sample.

Square root of the sum of the squares of the values subtracted from the mean, divided by the sample size subtracted by 1. So

$s = \sqrt{\frac{5*(0-1.52)^2 + 9*(1-1.52)^2 + 5*(2-1.52)^2 + 5*(3-1.52)^2 + 1*(4-1.52)^2}{24}} = \sqrt{\frac{32.24}{24}} = 1.16$

3 0

3 years ago

Does 60, 63, 87 form a right triangle

Nadya [2.5K]

No because if you use the pythagorean theorem, then you get 10,269=7,569. so the answer is no.

6 0

3 years ago

Read 2 more answers

1.) Expand and simplify (6x-7)+(x-3)+(4x-5) * a.)11x-5 b.)11x-15 c.)10x-15 d.)10×1

LiRa [457]

Answer:

the answer is b 11x-15

Step-by-step explanation:

your collecting like terms then combining them

7 0

4 years ago

Alan has $400 in his checking account. He withdraws $50 each week. The amount remaining in his account, f(x), after x weeks is

MrRa [10]

Answer:

{0, 50, 100, 150, ..., 350, 400}

Step-by-step explanation:

The range of Alan's balance will be multiples of 50 that are between (and including) 0 and 400.

{0, 50, 100, 150, ..., 350, 400}

_____

The expression for f(x) is ...

f(x) = initial balance - (rate of withdrawal) × (time period)

f(x) = 400 -50x

This is a continuous linear function defined for all x, and capable of producing f(x) values between -∞ and +∞. The range of this function is "all real numbers."

However, as applied to this problem, the domain of x is the set of integers from 0 to 8. The corresponding range is multiples of 50 from 0 to 8, that is, values 0, 50, ..., 350, 400.

8 0

3 years ago

Solve: 15.2+(-7.12) NEEDED ASAP!

garri49 [273]

The answer is 8.08
mark me brainliest if the answer is correct, thank you in advance :)

8 0

3 years ago