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3 years ago

Write and evaluate the expression. Then, select the correct answer.

Mathematics

1 answer:

FromTheMoon [43]3 years ago

4 0

zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

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Solve the system of equation 8x+5y=24<br> y=-4x

Natasha_Volkova [10]

Answer:

x=-2, y=8. (-2, 8).

Step-by-step explanation:

8x+5y=24

y=-4x

----------------

8x+5(-4x)=24

8x-20x=24

-12x=24

x=24/-12

x=-2

y=-4(-2)=8

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3 years ago

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How many lines of symmetry does a 15 sided polygon have?

DedPeter [7]

Answer: 15 lines of symmetry.

Step-by-step explanation:

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3 years ago

Suppose that the area between a pair of concentric circles is 49pi. Find the length of a chord in the larger circle that is tang

Lapatulllka [165]

Answer:

14 units

Step-by-step explanation:

We are given that the area between two concentric circles is $49\pi$

We have to find the length of chord in the larger circle that is tangent to the smaller circle.

Let $r_1,r_2$ be the radius of two circles.

$r_1$ be the radius of small circle and $r_2$ be the radius of large circle

We know that area pf circle= $\pi r^2$

Area of large circle = $\pi r^2_2$

Area of small circle = $\pi r^2_1$

Area between two circles = $49\pi$

Area of large circle -Area of small circle= $49\pi$

$\pi r^2_2-\pi r^2_1=49\pi$

$\pi(r^2_2-r^2_1)=49$

By pythagorus theorem

$AD^2=OA^2-OD^2$

$AD^2=r^2_2-r^2_1$

$AD=49$

$AD=\sqrt{49}=7$

Length of chord= $2\cdot AD$

Hence, the length of chord of the larger circle = $2\cdot7=14$ units

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3 years ago

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Equivalent expression for 4(2x+1) and for 1/2 (4x-8)

stellarik [79]

Answer:

8x+4 and 2x-4

Step-by-step explanation:

We are going to use factoring to make equivalent expressions. What you do is you take the number next to the parenthesis and multiply it with what is inside the parenthesis. So it would be 8x+4 and 2x-4. Hope this helps! :)

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3 years ago

What is the slope of this line? −13 23 13 −23 Number graph ranging from negative 10 to 10 on both the x and y axis. A line passe

olasank [31]

slope is

y2-y1/x2-x1

= 1 - -3 / 6-0 =

4/6 = 2/3

slope = 2/3

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3 years ago

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