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emmasim [6.3K]
3 years ago
8

!!!Please help!!!

Mathematics
1 answer:
Ahat [919]3 years ago
3 0
2 square root of 3(im like 98% sure)
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Which expression correctly shows 2x³y - 2y factored completely?
OverLord2011 [107]

Answer:

2y(x-1)(x^2+x+1)

Step-by-step explanation:

~~~2x^3y-2y\\\\=2y(x^3-1)\\\\=2y(x-1)(x^2+x+1)~~~~~~~~~~;[a^3-b^3 = (a-b)(a^2 +ab+b^2)]

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1 year ago
15 + r as a verbal expression
kodGreya [7K]

Hey there!

<h2>ANSWER: r+15</h2><h2>EXPLANATION:</h2><h2>15+r</h2>

Simplify by flipping.

r+15

Hope this helps!

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7 0
3 years ago
Which equation matches the graph
Alina [70]

Answer:

C

Step-by-step explanation:

You can see from the graph that everytime x goes up by 1, y goes down by 4, so the slope is -4.

The y-intercept is at -1

This means that the equation would be C. y = -4x - 1

8 0
3 years ago
The figure à shown on ancient coin which was once used in china.the coin is in the shape of a circle of radius 3cm with a square
lianna [129]

Answer:

(1) 2π - x² = 0 (2) x = 2.5 cm (3) perimeter = 10 cm

Step-by-step explanation:

(1)The area of the circular coin without the inner square removed is πr² where r = 3 cm is the radius of the coin. So, the area of the coin without the inner square removed is πr² = π(3 cm)² = 9π cm²

The area of the square of x sides removed from its center is x².

The area A of the each face of the coin is thus A = 9π - x²

Since the area of each face of the coin A = 7π cm²,

then

7π = 9π - x²

9π - 7π - x² = 0

2π - x² = 0

(2) Solve the equation 2π - x² = 0

2π - x² = 0

x² = 2π

x = ±√(2π)

x = ± 2.51 cm

Since x cannot be negative, we take the positive answer.

So, x = 2.51 cm

≅ 2.5 cm

(3) Find the perimeter of the square

The perimeter of the square, p is given by p = 4x

p = 4 × 2.51 cm

= 10.04 cm

≅ 10 cm

8 0
3 years ago
The ratio of boys to girls at a local sports club is 3 to 1 if there are 45 girls, how many boys are there
marysya [2.9K]

Answer:

135

Step-by-step explanation:

3 0
3 years ago
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