Answer:
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Step-by-step explanation:
.05n + $28 = $50.50
(.05n = $22.50)100
5n = 2250
n= 450 calls
You divide 22 by 10 (2.2) and then multiply that by 3 to get 30%, which is 6.6. Then, you divide 2.2 by 2 to get 1.1, which is 5%. After this you just add them up to get the answer as 7.7.
Also, if you have q calculator, you can do it the short way and do 22 × 0.35 = 7.7
The answer is shown above
(-4)^-3 =
-4^-3 = 
Basically in this situation there is no difference whether parenthesis are used or not.