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3 years ago

7

The line y=15x Intersex the quadratic function y=15x^2 at two points. what are the coordinates of the two points of intersection

?

1 answer:

REY [17]3 years ago

8 0

Answer:

D

Step-by-step explanation:

we can set up the equation as 15x = 15x^2

factoring we get

15x(x-1) = 0

So the solutions are when x are 0 and 1

this gives the coordinates

(0,0) and (1,15)

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at a clothing store, levi's jeans are on sale for 40% off. sales tax is 7%. which expression will calculate the total cost of le

aleksandrvk [35]

Given:

Discount = 40%

Sales tax = 7%

To find:

The total cost of levi jeans with an original price of x.

Solution:

Let x be the original price of the jeans. Then the price after 40% discount is

$Price=x-40\%\text{ of }x$

$Price=x-\dfrac{40}{100}x$

$Price=x-0.4x$

$Price=0.6x$

The price after 7% of sales tax.

$Price=0.6x+7\%\text{ of }0.6x$

$Price=0.6x+\dfrac{7}{100}\times 0.6x$

$Price=0.6x+0.042x$

$Price=0.642x$

Therefore, the total cost of the levi jeans with an original price of x is represented by the expression 0.642x.

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3 years ago

The ratio of girls to boys in Ms. Schnepfs after-school club is the same as the ratio of girls to boys in Ms. Elsendiony's after

LUCKY_DIMON [66]

Answer: 18

Step-by-step explanation:

Step-by-step explanation: The ratio of boys to girls in mr johnson's club: 4:12 =1:3

This ratio is same as the ratio of boys to girls inms greenesclub, 1:3

1:3 is same as 6:18

So there are 18 girls in ms greene club

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3 years ago

What is the difference in price per kg between chicken sold at $23.24/kg and turkey sold at $5.17/250 g?

Fed [463]

There are 1000 grams in 1 KILOgram.

therefore in 23.24/kg can be just written using grams as 23.24/1000, since 1kg = 1000 g.

so the price of the chicken per gram is then 23.24/1000 or $0.02324 per gram, roughly 2 and 1/3 pennies per gram.

and the turkey is 5.17/250 in grams already, that gives us $0.02068 per gram, which is roughly 2 pennies.

well, their price difference is 0.02324 - 0.02068, which is 0.00256 per gram unit.

since we know there are 1000 grams in 1 Kg, how much is that for 1000 grams or a Kg? 0.00256 * 1000 or $2.56.

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3 years ago

What's lateral surface area of a pyramid?

a_sh-v [17]

Step-by-step explanation:

The lateral surface area of a pyramid is the area of each side of a right rectangular prism. The lateral area of a right pyramid can be calculated by multiplying half of the perimeter of the base by the slant height. The lateral surface area can also be found using this equation (see attachment.)

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3 years ago

Consider the equivalence relation R = {( x, y) Ix-y is an integer}.

Vanyuwa [196]

Answer:

[1]=Z the set of integers

[1/2]={r/2| r is an odd integer}

Step-by-step explanation:

Denote by [a] the equivalence class of an element a.

We know that [a]={x|(x,a)∈R}. Then

[1]={x|(x,1)∈R}={x|x-1 is an integer}={x|x-1=k for some k∈Z}

={x|x=k+1 for some k∈Z}={k+1|k∈Z}={...,-2+1,-1+1,0+1,1+1,2+1,...}=Z

For the other class, we have

[1/2]={x|(x,1/2)∈R}={x|x-1/2 is an integer}={x|x-1/2=r for some r∈Z}

={x|x=r+1/2 for some r∈Z}={r+1/2|r∈Z}={...,-2+1/2,-1+1/2,0+1/2,1+1/2,..}

={...,-3/2,-1/2,1/2,3/2,...}={r/2| r is an odd integer}

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3 years ago