heyyy if you tell me the correct answer I’ll give you’re answer a 5 thanks and brainlest please hurry

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50