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saul85 [17]
3 years ago
12

Evaluate the expressions below for the given values. a. -4d + 3 if d = -1 b. k - m if k = 4 and m = -10​

Mathematics
1 answer:
Gemiola [76]3 years ago
6 0

Answer:

7; 14

Step-by-step explanation:

A. -4d+3

-4*-1+3=4+3=7

B. k-m

4-(-10)=14

I think this is right :D I hope this helps ;)

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Answer:

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Step-by-step explanation:

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3 years ago
Sarah wants to find the area of a rectangle. she knows the length of the rectangle is 9 inches. what else does she need to know?
Veseljchak [2.6K]
Area of a rectangle can be found with the formula:
Area = length × width

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3 years ago
The level of dissolved oxygen (DO) in a stream or river is an important indicator of the water's ability to support aquatic life
kaheart [24]

Answer:

a) It is most appropiate to apply t procedures with this sample because the population standard deviation is unknown. We have to estimate it from the sample standard deviation.

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c) As the null hypothesis was not rejected, the only error we could have made is a Type II error.

This Type II error is made when fail to reject the null hypotesis even when the alternative hypothesis is true.

In this context, it would mean that the aquatic life is really at risk (dissolved oxygen levels below 5 mg/l), but because the sample results combined with its size were not giving enough evidence to prove the claim.

Step-by-step explanation:

b) We have to perform a hypothesis test on the mean, at a significance level of 0.05.

The null and alternative hypothesis are:

H_0:\mu\geq 5\\\\H_a: \mu

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The sample size is 15, so the degrees of freedom are:

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The t-statistic is:

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For a t=0.95 and df=14, the P-value is P=0.18.

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6 0
3 years ago
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Marysya12 [62]

Answer:

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Step-by-step explanation:

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we can now substitute the value of x in the first equation

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Verify

2(3)+3 = 6+3 = 9

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3

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3 0
2 years ago
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mario62 [17]

Answer:

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Step-by-step explanation:

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5 0
3 years ago
Read 2 more answers
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