Answer:
10(x + 26)
Explanation:
In this problem, you are asked to multiply a sum by 10. The word sum means we are using addition, so you are adding two numbers together, and multiplying them by 10. Out of parts of the sum portion, you are given 26 and another number. You don't know the other number in this sum, so you can use the variable 'X' as the substitute for the other number in the sum.
for the sum, you would then have X + 26.
Now, to make sure you multiply the whole some by 10 and not just one part you have to use PEMDAS (or BEMA). In PEMDAS, P: parenthesis, comes before M multiplication. This means you do anything inside parenthesis before you multiply. So, if you put the X + 10 inside the parenthesis, no matter than the number that you substitute for x, you will always add it to the 26 before multiplying. If you left out the parenthesis, you would end up multiplying either the 26 of the X by 10 and then adding to the other number which would change the answer greatly.