What is the missing variable???

Part a : solve - vp + 40 < 65 for v . part b : solve 7w - 3r = 15 for r show your work!

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!