What is the percent of change from 1,000 to 800?

What is the surface area of the sphere?

V=x^4-y^4 pick three expressions that can represent the three dimensions of the prism (each in meters)

The half-life of a certain material is 0.002 second. approximately how much of a 14-gram sample will be left after 0.004 second? a. 12 grams b. 3.5 grams c. 0.06 gram d. 7 grams