Answer: (7.) the answer is 69
Explanation:
The best way to remember this is PEMDAS ("Please Excuse My Dear Aunt Sally)
Parenthesis, Exponent , Multiplication, Division, Addition, Subtraction (this is the order that you should work your problem)
6x+3(x-7) lets see where there is a parenthesis first (x-7), we're going to plug in 10 where x is listed >> (10-7)= 3
The problem now reads 6x+3(3)
We do not have exponents, so we move to see if there is multiplication
6x>> we're going to replace x with 10 to read 6*10 = 60
The other multiplication is 3(3) which = 9
your problem now reads : 60+9
There are no division so we move to Addition
60+9= 69
There are no subtractions so you are now done with your problem and left with the answer 69