x=2.5
5x = 5(2.5) = 12.5
I believe 12.5 is the answer
Answer:
The simplified form is: 
Step-by-step explanation:
To simplify the expression given we, need to open the brackets, and if there is power term. Then we need to group all the like terms and then arrange in the descending order of powers of the given expression.
Now the expression that is given to us is:

Here we will simplify it by grouping the like terms, as follows:

So this is the required simplified form.
Incorrect.
Go through the numbers and you'll find un-prime numbers ending in 1:
21, 81, 121,...
Answer:
question does not seem complete, from what i know it sounds like he should add up the test scores and divide it by five, that will give him his average which should be his grade, please update question if possible
i hope this helped ;)
Answer:
Step-by-step explanation:
Magnitude: |a|= 
Direction: in the negative direction of the Ox axe and Oy axe