Which number has the same value as 20 tens

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

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

How do i find the missing angle measure in a polygon