Which equations support the fact that rational numbers are closed under subtraction? select all that apply. 4.5 - 0.5=4 √8 - √8=0 2√3 - √3=√3 5√4 - √4 = 4√4

Ascuba diver was 80 feet below sea level and swam up at a rate of 4 feet per minute. the two solutions show how long it took the scuba diver to reach an elevation of 20 feet below sea level. lydia and max used the methods shown below to find the time it took the diver to reach the new elevation.

John bought 5 lemons and used 2 of them for a salad how much did he use for.a salad . he used % of the lemons.

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.