Please help answer both of them

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

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?