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Lilit [14]
2 years ago
9

Molly spent $15.60 on school supplies. She bought a binden for $3.40, dividers for $1.98, lunchbox for $8.60 and two identical f

olders. How much did each folder costs​
Mathematics
1 answer:
Finger [1]2 years ago
7 0

Answer:

Each folder was 81 cents

Step-by-step explanation:

First we subtract the given values from 15.6 to find out how much she has left when she buys the folders.

15.6-3.4-1.98-8.6=1.62

She has $1.62 remaining and she buy two identical folders. That means both were at the same price. So we just need to divide by two to find the cost of each individual folder.

1.62/2=.81

Each folder was 81 cents

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Step-by-step explanation:

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Ignacio is curious about the average age of cars in the commuter lot at Mis large university. He takes a random
spin [16.1K]

Answer:

Between 12.614 years and 16.386 years

Step-by-step explanation:

Given that:

Mean age (μ) = 14.5 years, standard deviation (σ) = 4.6 years, number o sample (n) and the confidence interval (c) = 90% = 0,9

α = 1 -c = 1 -0.9 = 0.1

\frac{\alpha }{2}  = \frac{0.1}{2} = 0.05

The z score of \alpha /2 is the same as the z score of 0.45 (0.5 - 0.05). This can be gotten from the probability distribution table. Therefore:

z_{0.05}=1.64

The margin of error (e) = z_{0.05}\frac{\sigma}{\sqrt{n} } = 1.64*\frac{4.6}{\sqrt{16} }=1.886

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4 0
3 years ago
Give the dimensions of the small prisms that can be used to pack the larger prism
Neporo4naja [7]
Okay we'll go through all the steps. Ready?

4 0
3 years ago
In a triangle ABC, measure of angle B is 90 degrees. AB is 3x-2 units and BC is x+3. If the area of the triangle is 17 sq cm, fo
Scorpion4ik [409]

Answer:

x=\frac{8}{3}\ cm

Step-by-step explanation:

we know that

The area of the right triangle ABC is equal to

A=\frac{1}{2}(AB)(BC)

we have

A=17\ cm^2

AB=(3x-2)\ cm

BC=(x+3)\ cm

substitute the values

17=\frac{1}{2}(3x-2)(x+3)

34=(3x-2)(x+3)

34=3x^2+9x-2x-6

3x^2+7x-6-34=0

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The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

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x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}

in this problem we have

3x^2+7x-40=0

so

a=3\\b=7\\c=-40

substitute in the formula

x=\frac{-7(+/-)\sqrt{7^{2}-4(3)(-40)}} {2(3)}

x=\frac{-7(+/-)\sqrt{529}} {6}

x=\frac{-7(+/-)23} {6}

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x=\frac{-7(-)23} {6}=-5

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The solution is

x=\frac{8}{3}\ cm

6 0
2 years ago
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pickupchik [31]

Answer:

Total cost, c = 7p

Step-by-step explanation:

1pound =$7

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3 0
3 years ago
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