Select all the true statements A. 2.3+(-2.3)= zero

B. (-3.7) +(4.1)positive

C. -2.6-(-12/4) is positive

D. 5/2+ (-2.5) is negative

E. 72 - (-100) is negative

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?