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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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Hello!

To solve this problem, we must:

  1. Solve for the length of the fence (aka height)
  2. Find the area of the lawn (trapezoid)
  3. Find the number of cans needed
  4. Find the price of all the cans

Area of a trapezoid, and why the formula works:

A trapezoid is a quadrilateral with one set of parallel sides known as bases. The other two sides are known as the legs.

To find the area of a trapezoid, we use the formula:

\frac{B_1 + B_2}{2}* h

This works because if we used the formula, we would be duplicating the trapezoid to form a rectangle with a side length of B1 + B2, and a height of h. Since the trapezoid is half of that, we divide by 2.

Solve for height:

The height is unknown but can be found using the Pythagorean Theorem.

The difference between the bases is the length of the bottom leg of the right triangle, and 17 is the hypotenuse.

Difference = 20 - 12 = 8

Hypotenuse = 17

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  • 225 = fence²
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The height is 15

Solve for area:

Now we can solve for the area.

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The area is 240

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The area of the lawn is 240 square meters. Each can cover 100 square meters.

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Since we can't use part of a can, we round up to three whole cans.

The price of 3 cans :

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£59.25

The Pythagorean Theorem:

The Pythagorean theorem is a very common geometry formula used to find the length of the hypotenuse in a right triangle, given the lengths of the two other bases.

The formula is : a^2 + b^2 = c^2

  • a is a leg
  • b is a leg
  • c is the hypotenuse

Images attached for your reference

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