An internet site sells 75 feature type cell phones. The ratio of the number of smartphones to the number of feature phones is 3:
5. How many cell phones are smart phones?
1 answer:
There are 45 smart phones
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1. 570
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2x+4
2(x+4)
(x/5)+6
(x+6)squared
X-5/x
Answer: y=0,5x²-x-1,5.
Step-by-step explanation:

We summarize (1) and (3):

Substitute b=-1 into (2):

From (5) subtract (4):

Substitute a=0,5 into (4):

Hense:
y=0,5x²-x-1,5.
Answer:
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Step-by-step explanation: