Follow the order of operation: PEMDAS
Parenthesis
Exponents (and roots)
Multiply
Divide
Add
Subtract
3 x (7-2) + 4
first do Parenthesis (as it shows up first)
7 - 2 = 5
Next, Multiply (the next one you have to do)
5 x 3 = 15
Finally, add
15 + 4 = 19
B. 19 is your answer
hope this helps