Help with this math problems?

Question

If you could explain how these answers are achieved so that I can learn how to do them it would be great.

14-20 over (4)(3) -12

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Evaluate 66 ft/s X 1 mi/5280 ft X 3600 s/h be sure to use proper units

Determine how far electricity travels in 7 min. express in miles.

What is the decimal equivalent of 33/40

solve for the unknown

s/9.0=3.0/0.6 S =?

Write 116 2/3 as a fraction or a mixed number.

Answer 1

1. (14-20) over (4)(3) - 12

Start with the top 14 minus 20 is negative 6

So your top is -6

With the bottom do order of operations from left to right

Please Excuse My Dear Aunt Sally

1. Parentheses 2. Exponents 3.Multiplication/Division 4. Addition/Subtraction

So first is Multiplication 4 times 3 is 12

12-12= 0

When working out a fraction if your denominator is 0 your answer is "Does Not Exist" because you can't divide a number by 0.

Answer: "DOES NOT EXIST"

2. Decimal Equivalent of 33/40

Your going to have to do long division.

33 divided by 40, I'm going to try to work it out on here...

           __0.825

     40 / 33.0

          -320

          ----------

           100

          -080

       -----------

           200

          -200

         --------

              0

Answer:

0.825

3. 116 2/3

Denominator times whole number

3 times 116=

Plus the numerator

348 plus 2 = 350 <-- thats your new numerator and you keep your denominator the same

Answer:

350/3

Hope this helps