Answer:
-328
Explanation:
Simply use BODMAS or BIDMAS; this is the order of your operations. It is an acronym that tells you what to do in what order
Brackets: there are no brackets, move on to indices/order
Indices/Order: for the first step, do 5^2, which is 25, and √49, which is 7. The equation is no 12-5*9(7)-25
Division/Multiplication: For this step, multiply 5, 9 and 7 to get 315. The equation is now 12-315-25
Addition/subtraction: For the final step, just solve 12-315-25 in the traditional left to right way, which is -328.
I have grouped addition and subtraction as well as division and multiplication together because they are done at the same time; if a question has either both addition and subtraction or division and multiplication, just solve these parts from left to right. Division is not superior to multiplication and, likewise, addition is not above subtraction.