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kolbaska11 [484]
3 years ago
10

Alice has 15 times as many crayons as Bryan. Write an equation to find the total number of crayons that Alice has.

Mathematics
1 answer:
vichka [17]3 years ago
6 0

Answer:

a = 15b

Step-by-step explanation:

It's given in the question that Alice has 15 times as many crayons as Bryan.

Let the number of crayons with Bryan = b

And the number of crayons with Alice = a

Therefore, equation representing the number of crayons with Alice will be,

a = 15b

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3 0
3 years ago
2x^2 + 2y^2 - 8x + 10y + 2 =0
scoray [572]

A circle of radius <em>r</em> centered at (<em>a</em>, <em>b</em>) has equation

(<em>x</em> - <em>a</em>)² + (<em>y</em> - <em>b</em>)² = <em>r </em>²

To get the given equation in this form, complete the square with respect to both <em>x</em> and <em>y</em>.

2<em>x</em>² - 8<em>x</em> = 2 (<em>x</em>² - 4<em>x</em>)

2<em>x</em>² - 8<em>x</em> = 2 (<em>x</em>² - 4<em>x</em> + 4 - 4)

2<em>x</em>² - 8<em>x</em> = 2 ((<em>x</em> - 2)² - 4)

2<em>x</em>² - 8<em>x</em> = 2 (<em>x</em> - 2)² - 8

2<em>y</em>² + 10<em>y</em> = 2 (<em>y</em>² + 5<em>y</em>)

2<em>y</em>² + 10<em>y</em> = 2 (<em>y</em>² + 5<em>y</em> + 25/4 - 25/4)

2<em>y</em>² + 10<em>y</em> = 2 ((<em>y</em> + 5/2)² - 25/4)

2<em>y</em>² + 10<em>y</em> = <u>2 (</u><u><em>y</em></u><u> + 5/2)² - 25/2</u>

So we have

2<em>x</em>² + <u>2</u><u><em>y</em></u><u>²</u> - 8<em>x</em> + <u>10</u><u><em>y</em></u> + 2 = 0

2 (<em>x</em> - 2)² - 8 + <u>2 (</u><u><em>y</em></u><u> + 5/2)² - 25/2</u> + 2 = 0

2 (<em>x</em> - 2)² + 2 (<em>y</em> + 5/2)² = 37/2

(<em>x</em> - 2)² + (<em>y</em> + 5/2)² = 37/4

(<em>x</em> - 2)² + (<em>y</em> + 5/2)² = ((√37)/2)²

which means this circle has radius (√37)/2 and center (2, -5/2).

8 0
3 years ago
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