In a day there are 86,400 seconds. Write this number in scientific notation.

The product of two negative rational numbers is always zero sometimes zero never zero

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)