x -y = 1
5x + 3y = 45
Solve the first equation for x: x = y + 1
Substitute x in the second with y + 1
5x + 3y = 45
5(y + 1) + 3y = 45
5y + 5 + 3y = 45
8y + 5 = 45
8y = 40
y = 5
Substitute 5 for y in x = y + 1
x = y + 1
x = 5 + 1
x = 6
Answer: (6, 5)
First step
12 x 1.3
Second step
15.6 x 7.5
The answer is 117 :)
81=3^4
I hope this helps! Good luck!
The common ratio between terms is 3, so the sequence has general 
-th term
for 
. The term exceeds 7000 when
which means the first time 
exceeds 7000 occurs when 
. Indeed,
while the previous term would have been
Answer:
A good rule is to change 10 to 15 percent of the water each week. If your tank is heavily stocked, bump that up to 20 percent each week. A lightly stocked aquarium can maybe get by for two to four weeks, but this should be the maximum length of time between water changes.
Step-by-step explanation:
This is the correct answer you want
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