In which of the following is the value of the variable a solution

a x+3=10, x=-7
b -x/5=-5, x=25

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

The length of a rectangle is x times the square root of 100. the width is one-half y more than three-halves x. given that the area of the rectangle is 125 cm2, which equation could represent the rectangle in terms of x and y? a) 5xy − 15x = 125 b) 5xy + 15x = 125 c) 15x2 − 5xy = 125 d) 15x2 + 5xy = 125

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2