What's the surface area for this?​

382

Step-by-step explanation:

Surface area = 2(7 × 8) + 2(7 × 9) + 2(8 × 9)

                      = 382

SA=382

Steps:

SA=2(7×8)+2(7×9)+2(8×9)

SA=2×56+2×63+2×72

SA=112+126+144

SA=382

the answer is 16ft

step-by-step explanation:

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: