Acertain quantity decays exponentially over time. the initial quantity at t = 0 is 1,000. the quantity decays at a rate of 2%. what is the quantity at t = 4?

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

What is the standard form of -5x^2+2x^4-11+x^3+3x

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?