Of all the species in the world, 4 out of every 5 are insects.
what percentage of species are insects?

Find the volume of the largest rectangular box in the first octant with three faces in the coordinate planes and one vertex in the plane x + 2y + 3z = 15.

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

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?