Could be 21. Try replacing function designators with the actual functions.
The chosen topic is not meant for use with this type of problem. Try the examples below.
[-1,9)u(2,10]
(−1,2)∪(−4,0)
(−1,29)∪(26,50)
radius = 3 feet
rearrange the formula making r the subject
πr³ = V ( multiply both sides by 3 to eliminate fraction )
4πr³ = 3V ( divide both sides by 4π )
r³ = 
= ( 3 × 36π ) / 4π = 3 × 9 = 27
take the cube root of both sides
r = ![\sqrt[3]{27}](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7B27%7D)
= 3
I hope this helps you
if he can run 10 miles in 85 minutes
8 miles in ? minutes
?.10 =8.85
?=8.85/10
?=4.17
?=68 minutes
