Check the picture below.

since the width is just a dimension unit, it can't be -31.
what is the length? well, the length is w + 30.
The formula is
A=p (1+r/k)^kt
A future value
P present value
R interest rate
K compounding periods
T time
When the compounding periods are daily balance after one year is
A=1,870×(1+0.197÷365)^(365×1)
A=2,277.06
When the compounding periods are monthly balance after one year is
A=1,870×(1+0.165÷12)^(12×1)
A=2,202.99
So will save
2,277.06−2,202.99
=74.07....answer
Hope it helps!
Answer:A
Step-by-step explanation:
I dont have enough time to try to type it out for you but here is a tutorial I found that can get the job done: https://www.wikihow.com/Multiply-Fractions-With-Whole-Numbers
And mods, please do not remove this answer, I am just trying my best to help a user with the easiest way to understand
C "<span>David’s equation is correct, because their spending will be multiplied by the number of months and then subtracted from their savings"</span> is the correct answer