It's 93.
simple calculate it by:
(76+68+83+x)/4=80
then 73*5-(67+75+73+69)=x
where x here is the grade needed to reach an av. of 80. 4 is the number of tests.
*common answer*
Answer:
The area is 100m^2
Step-by-step explanation:
Answer:

Step-by-step explanation:
Given:

Let's distribute the parenthesis

Let's subtract
from both sides

Let's add
to both sides

Now, let's divide both sides by
to get
alone

Hope this is helpful
I think it's 3
It should be 3 because if you have a base of 6 then your height must be 3 to get 18.