Each week, Tim wants to increase the number of sit-ups he does daily by 2 sit-ups. The first week, he does 15 sit-ups each day.

Write a function in the form f(n)=mn+b to represent the number of sit-ups, f(n), Tim does daily in week n.
A. f(n)=n^2+15
B. f(n)=2n+13
C. f(n)=2n+15
D. f(n)=2n^2+15

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

How can (square root of 25) ^2 be rewritten?

Solve the system of equations. 2x-2y=-4 and x+y=8. show work