∠A and ∠B\angle B ∠B are supplementary angles. If m ∠A=(x−18)∘\angle A=(x-18)^{\circ} ∠A=(x−18) ∘ and m ∠B=(x−20)∘\angle B=(x-20)^{\circ} ∠B=(x−20) ∘ , then find the measure of ∠B\angle B ∠B.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Frank is lending $1,000 to sarah for two years. frank and sarah agree that frank should earn a real return of 4 percent per year. instructions: a. the cpi (times 100) is 100 at the time that frank makes the loan. it is expected to be 113 in one year and 127.7 in two years. what nominal rate of interest should frank charge sarah?

Which two fractions are equivalent to 6/11? 6/22 and 18/33 12/22 and 18/33 12/22 and 18/22 3/5 and 6/10