Combine like terms to simplify the following expressions

5y^2 + 7y - 8y^2 - 8y + 11

Which expression shows the sum of the polynomials with like terms grouped together

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height