A boy has 11 coins in dimes and quarters. Their value is $1.70. How many of each does he have? Which of the following equations could be used to solve the problem?

a) x + (11 - x) = 1.70
b) 0.10x + 0.25(11 - x) = 1.70
c) 25x + 10(11 - x) = 1.70

15 points ! ~ see if you know the answer to both you!

In what form is the following linear equation written y=9x+2

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.