Answer:
7. 34
8. 75
I may be wrong, though I'm about 97% sure my work is correct. More than likely, if one of these are wrong it'll be 8, though I still doubt it is.
Explanation:
A=3
B=5
C=6
7.

once you have the letters substituted, simply solve the equation.
using PEMDAS, you'll need to convert the exponents first.

now, the equation should look like this:
6(3)+25-9
Now, you multiply as M comes before A and S in PEMDAS
6(3)=18
18+25-9
Now, reading left to right, A will come before S so you will do the addition first.
18+25=43
Your equation should now look like this:
43-9
Now, simply solve the subtraction problem.
43-9=34.
therefor, 7 should be 34.
8.

substitute the letters for their number values first:

Now, solve the exponent next:
5 squared (
) is 25
Your problem should now look like this:
(3)(25)
Next, you simply multiply to get the following:
3x25=75
Therefor, question 8 should be 75.