I think it’s 9+2 because it say sum
21x -15 + 5 = 10x - 5
21x -5 = 10x
11x = 5
x = 5/11
Answer: 2/4 is less than 2/3
The worth of Sarah's investment when she is 68 is $14,728.51.
<h3>What is the worth of the investment?</h3>
The formula that can be used to determine the worth of the investment is:
FV = P (1 + r)^n
FV = Future value
P = Present value
R = interest rate
N = number of years = 68 - 18 = 50
$500 x (1.07)^50 = $14,728.51
To learn more about future value, please check: brainly.com/question/18760477