125^2x = 5^4x-4 solve for x

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Define multiplicative inverse. give an example of a number and its multiplicative inverse.