Answer: The total amount the water change was -28 gallons by the end of the week <u>OR</u> The total amount the water changed decreased 28 gallons by the end of the week. Depending on how you want to word it.
Hope this helps!
Step-by-step explanation:
<u>Create you equation:</u>
x = the total amount the water changed
d = the amount of days
x = -4d
<u />
<u>Insert the known information into the equation and solve:</u>
x = -4d
x = -4(7)
x = -28
Answer:
$ 637.17
Step-by-step explanation:
First, let's convert the interest per year (iy) to interest per month (im):
(1 + im)¹² = 1 + iy
(1 + im)¹² = 1 + 0.08
1 + im = ![1.08^{1/12}](https://tex.z-dn.net/?f=1.08%5E%7B1%2F12%7D)
1 + im = 1.00643
im = 0.00643
im = 0.643%
The total amount (A) of an investment is:
![A = R*(\frac{(1+im)^{n}-1}{im})](https://tex.z-dn.net/?f=A%20%3D%20R%2A%28%5Cfrac%7B%281%2Bim%29%5E%7Bn%7D-1%7D%7Bim%7D%29)
Where R is the amount invested per month, and n the number of monthes. So:
![10,000 = R*(\frac{(1.00643)^{15}-1}{0.00643} )](https://tex.z-dn.net/?f=10%2C000%20%3D%20R%2A%28%5Cfrac%7B%281.00643%29%5E%7B15%7D-1%7D%7B0.00643%7D%20%29)
10,000 = R*15.6943
R = $ 637.17
Now, there are 60 minutes in 1 hour, thus 20 minutes is just 20/60 or 1/3 of an hour.
The answer is y=16
You must first combine like terms (8y-3y = 5y)
Then you must subtract 7 on both sides to cancel out the 7
You are left with 5y=80
Divide 5 by both sides to get you answer 80/5 = 16 so y=16