Prove that if a and b are two matrices such that a+b and a*b are both defined, then a and b are square matrices

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

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x

Which of the following is equal to the rational expression when x is not equal to -2 or -6?