A gumball machine has 130 red gumballs. If the red gumballs are 25% of the total number of gumballs, how many gumballs are in the gumball machine? A. 520
B. 32.5
C. 105
D.155

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

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

How to find the exponential function y=ca^x, with points (1,2) and (2,1)