If the function f has a continuous derivative on [0,c], then from 0 to c, integral f'(x) dx=?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Precalculus question, image attached.

Barbara has a good credit history and is able to purchase a car with a low-interest car loan. she co-signs a car loan for her friend jen, who has poor credit history. then, jen defaults on the loan. who will be held legally responsible by the finance company and why? select the best answer from the choices provided. a. barbara will be held legally responsible because she has a good credit history. b. jen will be held legally responsible because she drives the car. c. barbara will be held legally responsible because she is the co-signer. d. jen will be held legally responsible because she has a poor credit history. the answer is a