What is the percent change if the initial amount is 50 and the final amount is 70? Show your work

In a circle, a 45° sector has an area of 32π cm2. what is the radius of this circle? 32 cm 12 cm 16 cm 8 cm

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?