Find angle RST (4x - 24) (3x)

What is the inverse of the function f(x)=2x+1

Abbey purchased a house using a fixed rate mortgage. the annual interest rate is 4.2% compounded monthly for 20 years. the mortgage amount is $235,000. what is the monthly payment on the mortgage? this isn't a multiple choice question have to show my work

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°