Pls help
Simplify: −10x2 − 39x + 4 =

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).