Remember to follow PEMDAS:
Parenthesis, Exponents (& roots), Multiplication, Division, Addition, & Subtraction).
Also, for future references, remember to go from left to right.
First multiply 9 with 8
9 x 8 = 72
Next, add 2
72 + 2 = 74
Finally, add 4
74 + 4 = 78
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78 is your answer
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hope this helps