preform the indicated operator

Mathematics
Tutor: None Selected Time limit: 1 Day

4 * ( (10 / -2) + (10 * 5) + 9) =  216

15 + (7 *(17 - 7) ) + 9 = 94

Can someone help me go step by step to understand this two exercise. thank you

Oct 17th, 2014

4 * ((10 / -2) + (10 * 5)+ 9) = 216

4 * (-5 + 50 + 9) = 216

4 * 54 = 216

216 = 216

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15 + (7 * (17-7) ) + 9 = 94

15 + ( 7 * 10) + 9 = 94

15 + 70 +9 = 94

94 = 94

Oct 17th, 2014

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