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3 years ago

10

Describe two methods for adding and subtracting linear expressions

1 answer:

otez555 [7]3 years ago

8 0

Three main methods come to mind: Substitution method, Elimination method, Matrix row-reduction.The first two methods are taught in early grades in most high schools. Matrix row-reduction is taught in senior years in high school, or more likely, in the early years of a university math or science program.

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4x - 3 = 6x + 9 linear equations

deff fn [24]

First, we have to get the variable to one side of the equation, which can be done with simple subtraction.

4x -3 (-6x) = 6x + 9 (-6x)
-2x -3 = 9

now just solve as a regular equation:
-2x - 3 = 9
-2x = 12
x = -6

so, x is equal to -6

8 0

2 years ago

A rectangular prism has a length of 3 1/2 inches a width of 5 inches height of 1 1/2 inches what is the volume for the prism?

IgorLugansk [536]

Answer:

Thanks for asking!

Step-by-step explanation:

The volume of the prisim is 26.25

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2 years ago

How can you write the expressiHow can you write the expression 7(b – 2) in words?

OleMash [197]

Answer:

E.

the product of seven and the difference of b minus two

5 0

3 years ago

Read 2 more answers

Several years ago, 43% of parents who had children in grades K-12 were satisfied with the quality of education the students r

Ne4ueva [31]

<h2><u>Answer with explanation</u>:</h2>

Let p be the population proportion of parents who had children in grades K-12 were satisfied with the quality of education the students receive.

Set of hypothesis :

$H_0: p=0.43\\\\ H_a:p\neq0.43$

Confidence interval for population proportion is given by :-

$\hat{p}\pm z_c\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$ , where

n= sample size

$\hat{p}$ = sample proportion

and $z_c$ is the two-tailed z-value for confidence level (c).

As per given ,

Sample size of parents : n= 1085

Number of parents indicated that they were satisfied= 466

Sample proportion : $\hat{p}=\dfrac{466}{1085}\approx0.429$

Critical value for 90% confidence interval : $z_c=1.645$ ( by z-value table)

Now, the 90% confidence interval :

$0.429\pm (1.645)\sqrt{\dfrac{0.429(1-0.429)}{1085}}\\\\=0.429\pm 0.0247\\\\=(0.429-0.0247,\ 0.429+0.0247)\\\\=(0.4043,\ 0.4537)$

Thus , the 90% confidence interval: (0.4043, 0.4537).

Since 0.43 lies in 90% confidence interval , it means we do not have enough evidence to reject the null hypothesis .

i.e. We are have no evidence that parents' attitudes toward the quality of education have changed.

3 0

3 years ago

What is 829 rounded to the nearest ten

Allisa [31]

829 is rounded to 830 because the 9 is greater than 4 so its going to be rounded up.

8 0

2 years ago