Got this on my homework sheet, Penny invested some money in a different bank account. Use the following equations to explain her investment:

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250

What are the solutions of the following system? y=-2x^2 y=x-2