Question

Please help ‼️‼️ I’m doing functions

Answer 1

In this problem, you're looking for the value of t, so that f(t) = 48. That means if you put t into 5t-7, you'll get 48. To do this set up and solve an equation for t by setting 48 equal to 5t-7:
$5t-7=48$

Isolate the variable by adding 7 to both sides. 
$5t=55$

Divide by 5 on both sides to find t.
$t=11$

The answer is 11.