Mark, the director of a summer camp, must purchase prizes for the annual talent show. He spent a total of $198 on prizes for the top 14 performers.
Each performer receives either a $15 gift certificate for pizza or a gift
certificate for a stuffed animal worth $13, but he can't remember how
many of each prize he bought. Below are equations that three students
wrote to find the number of gift certificates x.
Which equation(s) could you use to solve this problem?
Laura: 15x + 13x = 198
Ellie: 15x + 13(14 - x) = 198
Robert: (15 + 13)x=198

step-by-step explanation:

the above table 1 will calculate the population size (n) after a certain length of time (t). all you need to do is plug in the initial population number (no), the growth rate (r) and the length of time (t). the constant (e) is already entered into the equation. it stands for the base of the natural logarithms (approximately 2.71828). growth rate (r) and time (t) must be expressed in the same unit of time, such as years, days, hours or minutes. for humans, population growth rate is based on one year. if a population of people grew from 1000 to 1040 in one year, then the percent increase or annual growth rate is 40/1000 x 100 = 4 percent.

step-by-step explanation: