compound interest equation for annually compounded

A=final amount
P=principal
r=rate in decimal
t=time in years
given that
A=1550
P=1000
r=5.5%=0.055
find t

divide both sides by 1000

take ln of both sides

use ln rule 

divide both sides by ln(1.055)

using a calculator, we get that t=8.18544 yrs
so about 8.2yrs
These are how the graphs will look, they are color coded so have a look at the equations first.
There are
7 red balls
8 red balls
1 yellow ball
Hope this helps have a good day! :)
Perimeter of the triangle, a+b+c
In this case, a=b=c=28
So, perimeter would be 28*3 = 84 cm
Answer:
$215.16
Step-by-step explanation:
Assuming he worked:
Tuesday - 4.14 hours
Wednesday - 3.14
Thursday - 7.14
Friday - 5.14
Add all the hours together: 4.14+3.14+7.14+5.14 = 19.56. Now times the hour by his rate of $11.
19.56(11) = $215.16