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2 years ago

1 Simplify the following expressions: 1) -4(a + 2) - a

Mathematics

2 answers:

aleksandrvk [35]2 years ago

8 0

1.C) -4a-8-a = -5a-8
2. C)-2 - x - 4.3= -6.3 -x
3.A) -2x+6-x-4= -3x+2
hope it helps

sertanlavr [38]2 years ago

5 0

These are very easy just distribute

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An NBC News/Wall Street Journal poll conducted in 2010 predicted that 61% of Americans did not support the Tea Party movement. I

fomenos

Answer:

The right answer is:

The poll provides strong evidence that more than 61% of Americans oppose the Tea Party movement this year. Why? The P-value (0.026) is less than the significance level of 5%.

Step-by-step explanation:

At a level of significance of 5%, a P-value of 0.026 (2.6%) means that the difference is significant and the null hypothesis is rejected.

The difference between the proportions is significant, what means that more than 61% of Americans oppose the Tea Party movement this year.

Note: The difference in the sample proportions (3%) is not enough to claim that the difference is significant.

The right answer is:

The poll provides strong evidence that more than 61% of Americans oppose the Tea Party movement this year. Why? The P-value (0.026) is less than the significance level of 5%.

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3 years ago

A number to the 8th power divided by the same number to the 5th power equals 27. What is the number?

Yuliya22 [10]

x^8/x^5=27

x=3 when you flip the equation (rounded number)

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2 years ago

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Jasmine sold 90 rolls of wrapping paper jasmine sold 2 times as many rolls of wrapping paper is Carly how many rolls of wrapping

Nina [5.8K]

First find out how many Carly sold:-

90 ÷ 2 = 45
Carly sold 45 rolls

Add to find out how many the sold together:-

90 + 45 = 135

Jasmine and Carly sold 135 rolls of wrapping paper together.

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2 years ago

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A salesman sells between 15 and 25 cars per month. What is the best estimate of the number of cars he will sell in a year? Show

Zigmanuir [339]

Answer:

240 cars

Step-by-step explanation:

The salesman sells 15 to 25 cars per month. Average number of cars sold per month would be = $(15+25)/2 = 20$ cars per month

one year has 12 months

Number of cars sold in an year = monthly rate x no. of months

= 20 x 12

= 240 cars

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2 years ago

What are the solutions of the equation 9x4 – 2x2 – 7 = 0? Use u substitution to solve. tions of the equation 9

skelet666 [1.2K]

Answer:

Step-by-step explanation:

Let $u^2=x^4\\u = x^2$

Subbing in:

$9u^2-2u-7=0$

a = 9, b = -2, c = -7

The product of a and c is the aboslute value of -63, so a*c = 63. We need 2 factors of 63 that will add to give us -2. The factors of 63 are {1, 63}, (3, 21}, {7, 9}. It looks like the combination of -9 and +7 will work because -9 + 7 = -2. Plug in accordingly:

$9u^2-9u+7u-7=0$

Group together in groups of 2:

$(9u^2-9u)+(7u-7)=0$

Now factor out what's common within each set of parenthesis:

$9u(u-1)+7(u-1)=0$

We know this combination "works" because the terms inside the parenthesis are identical. We can now factor those out and what's left goes together in another set of parenthesis:

$(u-1)(9u+7)=0$

Remember that $u=x^2$

so we sub back in and continue to factor. This was originally a fourth degree polynomial; that means we have 4 solutions.

$(x^2-1)(9x^2+7)=0$

The first two solutions are found withing the first set of parenthesis and the second two are found in other set of parenthesis. Factoring $(x^2-1)$ gives us that x = 1 and -1. The other set is a bit more tricky. If