Hello! :) Please help me solve this + explain your answer :)

I will indeed give you Brainlst <3

What is the effect on the graph of the parent function f(x) = x when f(x) is replaced with 3f(x)? a) shifts the line 3 units up b) shifts the line 3 units down c) increases the slope of the line by a factor of 3 d) decreases the slope of the line by a factor of 3

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?

Find the solution set for this equation: t^2+7t=0 separate the two values with a comma.