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Go to formulary and click on sphere. I'm not sure if we can do it with one formula, but you can combine them.

you would find us in our houses with your eyes.

Math is so hard because you have to think.

$$5x-3=13-3x$$

Move the unknown numbers to one side and the known numbers to the other.

$$5x+3x=13+3$$

Add the two unknown numbers.

$$5x+3x=8x$$

Add the two known numbers.

$${\mathtt{13}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}} = {\mathtt{16}}$$

Divide the total of the known numbers using the unknown numbers.

$${\frac{{\mathtt{16}}}{{\mathtt{8}}}} = {\mathtt{2}}$$

And you're done!

dont do anything Anonymous! go to a tutor or a most trusted friend's house.

Please stop procratinateing your homework. I am too but it's easy and i'm helping people.

As for math being hard, i find it hard too. But we have to just put up with it. What i would do is go look on the internet for some lessons on free websites, or ask a few questions here. NO one knows who you are, so you can ask whatever questions you want.We won't judge. 

i've read the Fault in Our Stars

the person who is saying those rude things, please stop! this site isnt for being a bully, it's for helping others and for just saying hello sometimes! please treat others as you want to be treated

Give your address

that would be great! we could have a party

'Expand' usually means that you need to use the distributive property (or an extended distributive property); for example:  Expand:     6x(2x² - 4x + 7)             [Answer is 12x^3 -24x² + 42x]

'Evaluate' usually means to enter values for variables and simplify to get the answer;                                      for example:  Evaluate when  x = 2  and  y = 5:     3xy + x - y        [Answer is 27] 

aww thats horrible about your mom! im very sorry! and for me getting not a lot of sleep is really easy, but you could just tough it out and as soon as you get home sleep

mabey you can do it by grade level (ei elemetary, middle, high, and phisics/caculus 7/ whatever you do in collage)

or do 

addtion, subtraction, mutiplcation, division, fractions, order of operations, equations/algebra, graphing, gometry etc.

mabey do subsets in each grade level, so that a middle school student who (for exaple) exceled at probabillity can help a third grader without being to intimadated to answer with questions like "What is the subset of 74 squared times the speed of light in a vaccum divded be the weight of a humming birds eyeball in scientific notation? please show all graphs."

mabey one for riddles/ brain teasers?

sorry for spelling mistakes i'm tired

you need to use distributive property, then solve it like a normal equation where there are variables on both sides

5(2x + 3) = 7(x + 1)

turns into

10x + 15 = 7x + 7

the solve the rest!

think of it on a number line

  <--l---l---l---l---l---l---l---l---l--->

     -5  -4  -3 -2  -1   0   1   2   3

-5 is less than 3 (-5 < 3)

use a number line.

----------------------------------------

-8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3

rember things to the right are greater than things to the left

-5 < 3

Great answers were given by geno3141 and Anonymous.

Since the pressure increases at the rate of 64 pounds/sq ft for each foot of descent,

the amount of increase can be written as  64 · n  where  n  represents the number of feet of descent. 

Initial Pressure + Increased Pressure Due To Depth  =  Final Pressure

    2120 lb/ft²   +          (64 lb/ft²/ft) · (n ft)             =      7240 lb/ft²

                                                   (64 lb/ft²) · n ft   =   5120 lb/ft²

                                                                        n   =   80 ft

When you multiply a number by 1, the answer is ALWAYS the number itself.

$$1*1=1$$