Answer:
n = 8
Step-by-step explanation:
Follow the question when turning the word equation into an equation
Because we know this is a quadratic equation, the product is a result of n multiplied by itself

Solve for n


n = 8
Given that Dan borrowed $1,250.00 from his brother who is charging him 5% simple interest. Now we have to find the total payment that he needs to payback including interest. Hence we can use simple interest formula
I=PRT
Where P= 1250
R=5% =0.05
T=18 months = 18/12 = 1.5 years
Now plug these values into above formula
I=PRT=1250*0.05*1.5=93.75
So total payment including interest = 1250+93.75=1343.75
Hence final answer is $1343.75.
8-4x=2x
-4x-2x=-8
-6x=-8
x=-6/-8
=3/4 or 0.75