Ming spent $15 at the movies. then she earned $30 babysitting. she spent $12 at the bookstore. now she has $18 left. how much money did ming have at the beginning?

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

What is the location of maximum over the interval [-3,1.5] for the graphed function?