Three friends went running. The table below shows their last 3 lap times.

Name
Lap 1
Lap 2
Lap 3
Paula
16 mins 20 secs
15 mins 50 secs
14 mins 40 secs
Kate
16 mins 30 secs
16 mins 20 secs
15 mins 40 secs
Sam
16 mins 10 secs
16 mins 10 secs
15 mins 30 secs

What is the range of these lap times?

minute(s) second(s)

1 min 50 sec

Step-by-step explanation:

The range is max value - min value

min value = 14 mins 40 sec

max value = 16 mins 30 sec

so now subtract these 16 mins 30 sec - 14 mins 40 sec

= 1 min 50 sec

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:

30

step-by-step explanation:

times by times