CAN SOMEBODY PLZZ HELP IM STUDYING FOR A MATH TEST PLLZZZ HELP!!! Thank You! When doing this equation below I have an exponent but when multiplying -4 by itself twice do I do (-4)x4 or (-4)x-4 and can you plz explain and again thank you so much for your help!!!

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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

Teams of 4 are competing in a 1/4 mile relay race. each runner must run the same exact distance. what is the distance each teammate runs?