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3 years ago

Help help help 8-15

Mathematics

1 answer:

frez [133]3 years ago

6 0

Pandas and combine like terms

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Please help with this question

NemiM [27]

Use the equation a^2 + b^2 = c^2.

225 + 1296 = c^2
1596 = c^2
Square root both

39 = c

4 0

3 years ago

What's the perimeter of a rectangular hexagon with one side measures 3 inches

MakcuM [25]

Answer:

6 sides of the hexagon * one side length of 3 inches = 18

Step-by-step explanation:

3 0

2 years ago

The number of "destination weddings" has skyrocketed in recent years. For example, many couples are opting to have their wedding

melamori03 [73]

Answer:

We conclude that the mean wedding cost is less than $30,000 as advertised.

Step-by-step explanation:

We are given the following data set:(in thousands)

29100, 28500, 28800, 29400, 29800, 29800, 30100, 30600

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{236100}{8} = 29512.5$

Sum of squares of differences = 3408750

$S.D = \sqrt{\frac{3408750}{7}} = 697.82$

Population mean, μ = $30,000

Sample mean, $\bar{x}$ = $29512.5

Sample size, n = 8

Alpha, α = 0.05

Sample standard deviation, s = $ 697.82

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 30000\text{ dollars}\\H_A: \mu < 30000\text{ dollars}$ We use one-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{29512.5 - 30000}{\frac{697.82}{\sqrt{8}} } = -1.975$

Now,

$t_{critical} \text{ at 0.05 level of significance, 7 degree of freedom } = -1.894$

Since,

$t_{stat} < t_{critical}$

We fail to accept the null hypothesis and reject it.

We conclude that the mean wedding cost is less than $30,000 as advertised.

8 0

3 years ago

What is the value of b to the 3rd power- 3a to the 5th power if a=2 and b=5

bekas [8.4K]

The answer is. 3^5 3^2

5 0

2 years ago

One of the giraffes, Bernard, is sick. Last week he weighed 2,490 pounds. This week, he weighs 2,312 pounds.

maks197457 [2]

Answer:

w+2,312=2,490

w= 178 pounds

Step-by-step explanation:

Let

W—-^ the amount of weight Bernard lost in pounds

We know that

The amount of weight Bernard lost plus the weight of this week must be equal to the weight of the last week

So…

The linear equation that represents this situation is

w=2,312=2,490

solve for w

Subtract 2,490 - 2,312 = 178lbs

If you found this helpful please let me know! I’m always striving to improve my answers! Have a wonderful day!

6 0

2 years ago

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