Which situation can be represented by a single expression?
a. the product of 3/4, and a number is 16.
b. 1/5 of a number
c. half of a number is 15.
d. the difference of 20 and a number is 14.

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase