I am subtracting the amount it took to make the phone, from the amount they sell the phone to a customer for.
115-(30+20)=x
115-50=x
65=x
A really easy one, just divide the number of calls, 1000, by 15 to get the number of calls unanswered, which is 150. Also, if 150 is taken from 1000, you get the total answered calls via subtraction, which is 850.
Mudando o sinal:
-16t² - 32t = 0
-16t*(t-2) = 0
16t = 0 --> t = 0
t-2 = 0 --> t = 2
Yes it is a very good prediction
