Hybrid cars get better gas mileage than cars with standard engines?
a) always
b) sometime
c) daytime
d) never

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

How to convert a density of 0.791g/cm3 to lb/ft3