Kaylie buys a sweater on sale for $40.11. If the discount is 20% off and she pays $1.91 in sales tax, what is the original price of the sweater?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.