What is the simplified form of (-7x^3+5x^2-x+6)-(-8x^3+x^2+3)

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

Arectangle has a length of 6cm by 8cm what is the length of a diagonal of the rectangle