Marco saves $3.75 from his allowance each week. how much money will he save from his allowance in 18 weeks?

Solve the problem by making up an equation. a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 3 times the age of the child?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12