According to Order of Operations rules, we must multiply before adding or subtracting.
With this in mind, notice that the first operation is mult.: (-5)(-4) = +20.
At the end is another mult.: -4(6) = -24.
So, write -20 - 6 - 24. End result: -50
Answer:
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5.7^2 + 9.8^2 - 10.2^2 / 2*5.7*9.8 =
24.49/111.72 = 0.219 = 0.22
answer is 0.22