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3 years ago

Please help . I’ll mark you as brainliest if correct !!!!

Mathematics

2 answers:

Tatiana [17]3 years ago

8 0

Answer:

15 meters

Step-by-step explanation:

The piece is made out of two pieces of parachute, a short one and a long one. The short on is 21 meters shorter than the longer one, if the longer one is 36 meters than the short piece is 36 meters - 21 meters

36 - 21 = 15

This means that the short piece is 15 meters long

We can check this by adding the short piece and the long piece hoping that it equals the total length, 51 meters

36 + 15 = 51

That means that you were correct

pav-90 [236]3 years ago

3 0

31-21=15
Answer: 15m
Answer check: 36+15=51✅

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Mark spends a total of $68.82 for 2 pairs of sneakers with the same cost. The sales tax is $5.32. Mark also uses a coupon for $3

shutvik [7]

Each pair of sneakers cost $33.25

Step-by-step explanation:

Given,

Total spent by Mark = $68.82

Sales tax = $5.32

Coupon used = $3.00

Price without sales tax = Total spent - sales tax

Price without sales tax = 68.82 - 5.32 = $63.50

As Mark used coupon, we will add this amount.

Amount of sneakers = Price without sales tax + Coupon used

Amount of sneakers = 63.50+3.00 = $66.50

As this is price of two sneakers, we will divide it by 2;

Cost of one sneaker = $\frac{66.50}{2}=\$33.25$

Each pair of sneakers cost $33.25

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3 years ago

What is 35 x 345? Solve and I will give you money

Otrada [13]

Answer:

12075

Step-by-step explanation:

35 x 345 = 12075

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2 years ago

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Add or subtract as indicated. reduce to the lowest term. 1 1/3 + 2 1/3

Ann [662]

2 1/3 = 7/3

Both numbers should be improper fractions.

11/3 + 7/3 = 18/3

Now the fractions must be simplified
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3 years ago

When the sample size and the sample proportion remain the same, a 90 percent confidence interval for a population proportion p w

deff fn [24]

Answer:

A 90% confidence interval for p will be narrower than the 99% confidence interval.

Step-by-step explanation:

The formula to compute the (1 - α) % confidence interval for a population proportion is:

$CI=\hat p\pm z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

Here $\hat p$ is the sample proportion.

The margin of error of the confidence interval is:

$MOE= z_{\alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n}}$

The MOE is dependent on:

Confidence level
Standard deviation
Sample size

The MOE is directly related to the confidence level and standard deviation.

So if any of the two increases then the MOE also increases, thus widening the confidence interval.

And the MOE is inversely related to the sample size.

So if the sample increases the MOE decreases and vice versa.

It is provided that the sample size and the sample proportion are not altered.

The critical value of z for 90% confidence level is:

$z_{\alpha/2}= z_{0.10/2}=z_{0.05}=1.645$

And the critical value of z for 99% confidence level is:

$z_{\alpha/2}= z_{0.05/2}=z_{0.05}=1.96$

So as the confidence level increases the critical value increases.

Thus, a 90% confidence interval for p will be narrower than the 99% confidence interval.

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3 years ago

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