Answer:
9 + 10 +x= 21
x=21-19
x=2
add 2 in left hand side to get 21
The base is 30.
Hopefully I got this correct, not 100%
It is equal to 2(x)^3 because pemdas, exponnets come before multiplication so it would be x^3 then multiply whatever that is by 2
2x^3 is answer (4th choice)
