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Ne4ueva [31]
3 years ago
9

Evaluate the following expression at x = -5 -2x-3

Mathematics
1 answer:
Aleonysh [2.5K]3 years ago
5 0

Answer:

7.

Step-by-step explanation:

-5 x -2 = 10 (2 negatives being multiplies = positive)

Then, 10 - 3 = 7.

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If p(x) = 2x2 – 4x and q(x) = x – 3 what is (p*q)(x)
igomit [66]
<span>The correct answer is 2x</span>²<span>-16x+30.

Explanation<span>:
(p*q)(x) is a composition of the two functions p(x) and q(x); it is the same as p(q(x)). We replace every x in p(x) with our value of q(x), x-3:
instead of 2x</span></span>²<span><span>, we have 2(x-3)</span></span>²<span><span>, and instead of -4x, we have -4(x-3).

This gives us 2(x-3)</span></span>²<span><span>-4(x-3). This is the same as 2(x-3)(x-3)-4(x-3).

Multiplying, we have
2(x*x-3*x-3*x-3(-3))-(4*x-4*3)
=2(x</span></span>²<span><span>-3x-3x+9)-(4x-12)
=2(x</span></span>²<span><span>-6x+9)-4x+12.

Using the distributive property gives us
2*x</span></span>²<span><span>-2*6x+2*9-4x+12
=2x</span></span>²<span><span>-12x+19-4x+12.

Combine like terms, and we have 2x</span></span>²<span><span>-16x+30.</span></span>
6 0
3 years ago
Read 2 more answers
Points A, B, and C lie on the same line.
lakkis [162]
Answer would be 140*
6 0
3 years ago
Whats 9x-6-13x=94? how do you do it?
rewona [7]
9x-6-13x=94

-4x-6=94

-4x=100

x= -25
6 0
3 years ago
A recipe calls for 3 cups of cashews for 5 cups of flour. Using the same recipe, how many cups of flour will you need for 2 cups
notka56 [123]

Answer

3 cups of flower

Step-by-step explanation:

7 0
3 years ago
In a certain population, body weights are normally distributed with a mean of 152 pounds 30) and a standard deviation of 26 poun
Paul [167]

We are given the following variables:

μ = the sample mean = 152 pounds

σ = the standard deviation = 26 pounds

x = the sample value we want to test = 180 pounds

n = the sample size = unknown

MOE = margin of error = 4% = 0.04

Confidence level = 96%

 

The first thing we can do is to find for the value of z using the formula:

z = (x – μ) / σ

z = (180 – 152) / 26

z = 1.0769 = 1.08

Since we are looking for the people who weigh more than 180 pounds, therefore this is a right tailed z test. The p value is:

p = 0.1401

 

Then we can use the formula below to solve for n:

n = z^2 * p * (1 – p) / (MOE)^2

n = 1.08^2 * 0.1401 * (1 – 0.1401) / (0.04)^2

n = 87.82 = 88

 

Therefore around 88 people must be surveyed.

8 0
3 years ago
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