9x + 4y when x =4 and y=-3

Why do interests rates on loans to be lower in a weak economy than in a strong one

The first floor of marcus’ house is 1,440 square feet. he will cover 1,033 square feet with wood and the rest with tile. a box of tiles will cover 11 square feet. how many boxes of tile does marcus need to buy to cover the floor?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way