Answer:
B
Step-by-step explanation:
its the 1st step
f^-1(x)=100-x
x Is a valor mathematic
Answer: the answer is 3(7+3)
Step-by-step explanation: since 7+3 is in paranthases you add them first to get 10 and you multiply it by the 3 to get 30. We know its correct because 21+9=30.