Ben has 8 rows of math problem to answer each row has 5 problems. how many problems dose ben have to answer?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap