Answer:
Here,
length = 8m
height = 4m
4s = 15 per m^2
Now,
300 per meter = 300 * 15 per m^2
= 4500 per m^2
He made erron in step 3. He forgot add 4. it should be
-4m + 4m = -32 - 8n + 4n +4
Greeting
Answer:
10 %
Step-by-step explanation:
We first find change in the quantities
Then we write the change in quantity on original quantity and multiply by 100%
This implies that,



Therefore the percentage increase is 10%
Answer:
Given expression has the value 69
Step-by-step explanation:
Given equation is:

Now we have to put x = 3
So the equation will become:

By simplifying:
As 
and 2*3 = 6
So the above equation will become:

So the value of given expression is 69.
i hope it will help you!