AzizHusain

If there is only 1 value, then it has to be the median! So, 21 is the median.

Convert 1 3/8 to an improper fraction and then add.

1 3/8 --> (1*8 + 3) / 8 = 11/8.

5/32 + 11/8.

The easiest common denominator is 32 - multiply both the numerator and denominator of 11/8 by 4.

5/32 + 44/32.

You should be able to take it from there.

Be more specific please.

You have two choices: Multiply directly or simplify first. 

Note that you can divide 10 and 24 by 2 -->

7/5 * 12/7

Now, cross out the 7's -->

1/5 * 12/ 1

12/5

You are left with 12/5 or 2.4.

What needs to be done here?

Find the molar mass of SNH:

S = 32 g/mol

N = 14 g/mol

H = 1 g/mol

32 + 14 + 1 = 47 g/mol.

Now, 188.35 / 47 = ~4.

We need 4 of each element.

This means that SNH (Empirical formula) --> S₄N₄H_4. (Molecular formula).

Let's set up an equation after defining some variables:

L = length & W = width

L = 2W + 7 (length is 7 more than twice the width)

Perimeter of a rectangle is 2L + 2W...

2(2W + 7) + 2W = 44.

Distribute the 2.

4W + 14 + 2W = 44.

Combine like terms and subtract 14 from both sides.

6W = 30.

Solve for W.

W = 30/6 = 5.

So, L = 2W + 7 = 2(5) + 7 = 10 + 7 = 17.

L = 17 cm.

W = 5 cm.

Check: 2L + 2W = 44. 

2(5) + 2(17) = 44.

10 + 34 = 44. Yes.

I assume it should be (2/3)x and not 2/(3x).

To make life easier, multiply both sides by 18 to get rid of the 1/18 fraction.

Now, you end up with 18*(1/9) - 18*(2/3)x = 18*(1/18)...

You should be able to solve it from here...

An exponent is used to lessen the work of multiplying the same number a specific number of times.

Ex. 5^3 is the same as 5*5*5. It is easier to write out 5^3. 

Ex. 10^1000 would take forever to write out and solve if it weren't for exponents.

-(7c^-6)^3

Evaluate the terms separately:

-(7^3)[(c^-6)^3]

-(343)(c^(-6*3))

-343c^-18

-343/c^18.