B) how would
You work out 7 2/3 + 2 1/5

9 13/15

Step-by-step explanation:

Find a common denominator which is 15

2        10.             1.               3

—  =  ——.          ——   =      ——

3        15              5               15

7 + 2 = 9

10/15 + 3/15 = 13/15

9  13/15

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

the answer is 48m^2!

step-by-step explanation: