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2 years ago

What is 9x7 equal to i been stuck

Mathematics

1 answer:

ololo11 [35]2 years ago

4 0

Answer:

9x7=63

Step-by-step explanation:

just use a calculator for multiplication

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vodka [1.7K]

X=5 if you solve the equation 20=8x/2

7 0

3 years ago

Andrea spent 5/9 of her money buying a guitar if she had €296 left how much had she had first

stealth61 [152]

Answer:

kkk

Step-by-step explanation:

6 0

3 years ago

Express as -80/112 as a rational: numerator = -5

Anastasy [175]

Answer:

-80\112 = -5\7

we divided both numbers by 16

8 0

3 years ago

The standard deviation of a sample taken from population A is 17.6 for a sample of 25.

lawyer [7]

Answer:

The standard deviation of the sample mean differences is _5.23_

Step-by-step explanation:

We have a sample of a population A and a sample of a population B.

For the sample of population A, the standard deviation $\sigma_A$ is

$\sigma_A = 17.6$

The sample size $n_A$ is:

$n_A = 25$ .

For the sample of population B, the standard deviation $\sigma_B$ is

$\sigma_B = 21.2$

The sample size $n_B$ is:

$n_B = 30$ .

Then the standard deviation for the difference of means has the following form:

$\sigma=\sqrt{\frac{\sigma_A^2}{n_A}+\frac{\sigma_B^2}{n_B}}$

Finally

$\sigma=\sqrt{\frac{17.6^2}{25}+\frac{21.2^2}{30}}\\\\\sigma= 5.23$

7 0

4 years ago

Find the areas of the trapezoids

Sholpan [36]

Answer:

12 units²

Step-by-step explanation:

The area (A) of a trapezoid is calculated as

A = $\frac{1}{2}$ h (b₁ + b₂ )

where h is the perpendicular height and b₁, b₂ the parallel bases

Here h = 4 ( perpendicular distance between the bases ) and

b₁ = SR = 2, b₂ = TA = 4 , then

A = $\frac{1}{2}$ × 4 × (2 + 4) = 2 × 6 = 12 units²

5 0

3 years ago