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Masja [62]
3 years ago
12

Easy Bucks... For what values of y does the binomial 3y−5 belong to the interval (−1; 1)?

Mathematics
2 answers:
scoundrel [369]3 years ago
7 0

Answer:

y\in(\frac{4}{3},2)

Step-by-step explanation:

We are given that a binomial

3y-5

We have to find the value of y for which binomial belongs to the interval (-1,1).

In order to find the value of y we will substitute binomial equal to zero.

3y-5=0

3y=5

y=\frac{5}{3}

When we substitute y=\frac{5}{3} then binomial belongs to given interval because 0 lies between -1 and 1.

If substitute3y-5=-1

Then, we get 3y=-1+5=4

y=\frac{4}{3}

When we substitute 3y-5=1 then we get

3y=1+5=6

y=\frac{6}{3}=2

If the value of y lies between \frac{4}{3} and 2 then the binomial belongs to interval (-1,1).

kati45 [8]3 years ago
3 0

3y-5 = -1

3y=4

y = 4/3


3y-5 = 1

3y = 6

y = 2


y must be between 4/3  and 2

y must be between 1  1/3 and 2

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Answer:

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Vsevolod [243]
Short Answer 10
The tough part is the number of drinks.
Let the number of them be x
4.5 x + 3 + (10/100) * (4.5x + 3) + (7/100) * (4.5 x + 3) ≤  60

The tip is not included in the tax, and the tax does not include the tip. You can shorten this up quite a bit.
4.5 x + 3 + (10/100) * (4.5x + 3) + (7/100) * (4.5 x + 3) ≤  60
(1 + 10/100 + 7 /100) (4.5x + 3) ≤  60     Combine the tax, tip, scone and Lattes 

(1.17) * (4.5x + 3) ≤ 60                            Divide by 1.17
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Discussion.
There's a problem. He can't buy 0.72 of a Latte. He can only buy 10 of them. In this case we must round down so what happens if he buys 10 lattes? Does the price the taxes and the tip allow him to get another Latte? The answer should be no because then you would be 11 lattes and the tip and taxes would push you over 60 dollars. But be careful, sometimes things like this can alter you answer.. 

Answer: 10 <<<<
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