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3 years ago

Hhhhhhheeeellllpppp mmmmmeeeeee

Mathematics

1 answer:

lora16 [44]3 years ago

7 0

Hey there! I’m happy to help!

The surface area is basically the area of the surface of the shape. So, if you have a cube, it’s the area of all of the surface of the cube, not anything inside.

We see that we have a net of this square pyramid. If we fold it up, the square and four triangles will make up the surface of the 3D shape we see. So, we need to find the area of all of these shapes.

SQUARE
To find the area of a square, you multiply one of the sides by itself (all the sides are the same)

10(10)=100

TRIANGLES
To find the area of a triangle, you take the base and multiply the height and then divide it by two.

10(12)=120
120/2=60
Since we have four triangles, we multiply it by four.
60(4)=240

Finally, we add this all up.

240+100=340

Therefore, the answer is 340 square inches.

I hope that this helps! Have a wonderful day!

You might be interested in

A men’s softball league is experimenting with a yellow baseball that is easier to see during night games. One way to judge the e

vodomira [7]

Answer:

Yes. There is enough evidence to support the claim that there are fewer errors on average when the yellow ball is used.

Step-by-step explanation:

The question is incomplete:

The sample data is:

Yellow 5 2 6 7 2 5 3 8 4 9

White 7 6 8 5 9 11 8 3 6 10

This is a hypothesis test for the difference between populations means.

The claim is that there are fewer errors on average when the yellow ball is used.

Then, the null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a:\mu_1-\mu_2< 0$

The significance level is α=0.05.

The sample 1 (yellow ball errors), of size n1=10 has a mean of 5.1 and a standard deviation of 2.42.

The sample 2 (white balls errors), of size n2=10 has a mean of 7.3 and a standard deviation of 2.41.

The difference between sample means is Md=-2.2.

$M_d=M_1-M_2=5.1-7.3=-2.2$

The estimated standard error of the difference between means is computed using the formula:

$s_{M_d}=\sqrt{\dfrac{\sigma_1^2+\sigma_2^2}{n}}=\sqrt{\dfrac{2.42^2+2.41^2}{10}}\\\\\\s_{M_d}=\sqrt{\dfrac{11.665}{10}}=\sqrt{1.166}=1.08$

Then, we can calculate the t-statistic as:

$t=\dfrac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\dfrac{-2.2-0}{1.08}=\dfrac{-2.2}{1.08}=-2.037$

The degrees of freedom for this test are:

$df=n_1+n_2-1=10+10-2=18$

This test is a left-tailed test, with 18 degrees of freedom and t=-2.037, so the P-value for this test is calculated as (using a t-table):

$P-value=P(t$

As the P-value (0.028) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that there are fewer errors on average when the yellow ball is used.

3 0

4 years ago

What is the volume of this rectangular prism? 4/3cm 4/3cm 4/3cm

DedPeter [7]

Answer:

2.37 $cm^{3}$

Step-by-step explanation:

Multiply all dimensions of the rectangular prism

length x width x height = volume

4/3 cm x 4/3 cm x 4/3 cm = 2.37 $cm^{3}$

Answer in Mixed Number: $2\frac{10}{27}$

Answer in Improper Fraction: $\frac{64}{27}$

8 0

3 years ago

Hannah has $482.75 in her savings account. She would like her account balance to be more than $1,250 before she buys a cell phon

Marina CMI [18]

The inequality equation would be 482.75+82.25x1250 subtracting the amount that Hannah already has from the goal would amount to 767.25, therefore she only needs to save up to equal or more than this amount. Dividing this by 82.25 would then give us how many months this would take equal or greater than 9.33 months.

7 0

3 years ago

A television that was originally marked $199.95 is now 25% off. Write a linear expression for the new cost of the television. Th

ioda

Answer is c

199.95 x 25/100

=49.9875

Sale price

=199.95-49.9875

=149.9625

=149.96

5 0

4 years ago

Read 2 more answers

Is the expression 3x + 2x - 4 in simplest form? Explain.

viva [34]

Answer:

Step-by-step explanation:

you have to subtract 2x from 3x, so you have just x( you don't need the one in front of it)

So the answer would be ( x-4)

Hope that this helps you and have a great day :)

7 0

3 years ago

Read 2 more answers