What is 5x5+4-6x12 my teacher told me the wrong answer i need help

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9