Answer:
Kendra needs 3 coins (1 coin of 25 cent & 2 coins of 1 cent) to add 27 cents in 73 cents to make 1 dollar
Step-by-step explanation:
Given :
Kendra has 73 cents
She need 1 dollar to by a ball
∴ She requires additional money = 
Standard Coins available are 50 cents , 25 cents, 10 cents, 5 cents and 1 cent.
To make 27 cents = 
= 1 coin of 25 cent & 2 coins of 1 cent
F=9/5c+32
-31=9/5c+32
-63=9/5c
-35=c
I'll use my own formula (similar to yours tho)
A=future amount
p=invested
r=rate in decimal
n=number of times per year compounded
t=time in years
so
when will A=2P
subsitute 2P for A
also quarterly means 4 times a year or n=4
and 12%=0.12=r
so
divide both sides by P
simplify
take the ln of both sides
divide both sides by 4ln(1.03)
use calculator
5.86244=t
about 5.9 years
These problems are simple to solve once you know what you're looking for! All you're going to need is a protractor which is something almost every classroom has. You can also print one offline if you're currently at home. Line up the little hole in the bottom of the protractor with the point in the angle on your paper. The 0 degree line should also be matching up with the bottom angle line. Then looking at the line at the top of your angle, see to what number that line is pointing to.
https://www.google.com/search?q=protractor&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiutKPf9cLTAhVm2IMKHa...
It should add up to.
x= 0.312866
