Helen is 54 inches tall and grows at a rate of 1.2 inches per year. Which of these equations models this situation?

Use substitution to solve the system: x=3y-2 5x+4y=28

Two numbers have a difference of 24. What is the sum of their squares if it is a minimum? 288 1156 366 576

Gas mileage is the number of miles you can drive on a gallon of gasoline. A test of a new car results in 520 miles on 20 gallons of gas. How far could you drive on 40 gallons of gas? What is the car's gas mileage? Show and explain your work.

0.9 (x-20) = 830 solve the equation

Write a expression that is equivalent of 4+3 (5+x)

At the mall Greg purchased three CDs which cost $10.68 each if Greg has $79 in his wallet before the purchase how much money is left in his wallet

Order them from greatest to least. 1 lb = 16 oz 1 oz ≈ 28.3 g 800 g, 1.6 lb, 30 oz

When four times the number is added to 7 times the result is 33. What is the number?

A tablet computer costs $189.69 including tax. It is marked up 30%. What is the final price of the tablet computer after it is marked up? A. $56.91 B. $132.78 C. $219.69 D. $246.60

Jeff found 3 times as many seashells as his sister. Jeff found 39 seashells. How many seashells did his sister find? Write an equation to represent the situation. Then solve the equation to answer the problem.