Pls me which expression represents "subtract a number, n, from 10 then multiply by nine cubed"?
a) 9cubed * (n-10)
b) 9cubed+10n
c) 9cubed-10n
d) 9cubed*(10-n)

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?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

According to the 2008 u. s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.