[20 + (2.5 × 3)] - 3^3

0.5

Step-by-step explanation:

0.5

Step-by-step explanation:

[20+(2.5×3)]-3^3

2.5×3=7.5

[20+7.5]-3^3

27.5-3^3

3^3=27

27.5-27=0.5

10cm

step-by-step explanation:

ik

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: