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ryzh [129]
3 years ago
15

Explain what a variable is in an addition or subtraction expression

Mathematics
2 answers:
Alecsey [184]3 years ago
5 0
A variable is an unknown value in any addition,subtraction,multiplication,and/or division equation
alexira [117]3 years ago
4 0
As my friend unit has already explained,is is a place holder in an equation
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Several years​ ago, 39​% of parents who had children in grades​ K-12 were satisfied with the quality of education the students r
BaLLatris [955]
<h2>Answer with explanation:</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.

Given : Several years​ ago, 39​% of parents who had children in grades​ K-12 were satisfied with the quality of education the students receive.

Set hypothesis to test :

H_0: p=0.39\\\\H_a :p\neq0.39

Sample size : n= 1055

Sample proportion : \hat{p}=\dfrac{466}{1055}=0.441706161137\approx0.44

Critical value for 95% confidence : z_{\alpha/2}=1.96

Confidence interval : \hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}

0.44\pm (1.96)\sqrt{\dfrac{0.39(1-0.39)}{1055}}\\\\0.44\pm0.0299536805135\\\\0.44\pm0.03\\\\=(0.44-0.03, 0.44+0.03)\\\\=(0.41,\ 0.47)

Since , Confidence interval does not contain 0.39.

It means we reject the null hypothesis.

We conclude that 95​% confidence interval represents evidence that​ parents' attitudes toward the quality of education have changed.

8 0
3 years ago
Solve for x 3x-3&gt;x+7
Sever21 [200]

Answer:

x>5

Step-by-step explanation:

6 0
3 years ago
How do you multiply(2x+3)(x-7)
kompoz [17]

Answer:

2x(x-7)+3(x-7)

2x²-14x+3x-21

2x²-11x-21

6 0
3 years ago
What is the slope of a line that contains the points (5, -3) and (7, 3)? *
Allisa [31]

Slope formula: y2-y1/x-x1

We can use the given points to solve.

3-(-3)/7-5

6/2

3

Best of Luck!

4 0
3 years ago
Need help :((<br><br> plss help i took a screenshot so you can see
Mashcka [7]

Answer: 5:4

Step-by-step explanation: you divide them i believe :)

7 0
3 years ago
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