Answer:

Step-by-step explanation:

<u>Expand the terms in the bracket</u>
That's

<u>Add 3y to both sides of the equation</u>

Subtract 7 from both sides by the equation

<u>Divide both sides by - 4</u>

We have the final answer as

Hope this helps you
The first one is arithmetic sequence as each term decreases by same amount
(1/3) as x = 1,2,3,4...
Answer:
t= 3 years
Step-by-step explanation:
So far we have 2 useful relationships
and 
Now, clearing t

I apply logarithm
years
Done
Answer:
12
Step-by-step explanation:
4x3=12
Answer:
1
Explanation:
A quadratic needs a squared term, in this case x2