1.) 3 (3t + s)
distribute
9t + 3s
plug in the variables
9 ( 12 ) + 3 ( 9 )
108 + 27
135
2.) 2s - t
plug in the variables
2 ( 9 ) - 12
18 - 12
6
I hope this helped and i sincerely hope that this was the brainliest answer!
have a nice day
Answer:

Step-by-step explanation:
I am going to assume that by "f-1(x)" you mean
, which makes this an inverse function problem. To find the inverse of a function, simply swap x and y, then solve for y.

Answer:
C=25.13cm
Step-by-step explanation:
A=50.24
A=πr^2
C=2πr
Solving for C
C=2 square root πA=2xsquare root πx50.24=25.12637cm
if the notebooks cost 3.59 and pens cost 1.49, with x representing the notebooks and y representing the number of pens and an amount of $13, the inequality would be written as 3.59x+1.49y13
Pls mark as brainliest if this helped :)
4600 pounds
Work: 2.3 * 2000