What is -2(3x^2-7x+4)+(x+1)(x-7)

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Change negative exponents to positive. then solve. round to four decimal places