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2 years ago

7

yesterday 15 out of 20 students attended choir practice. which does not respresent the part of the students who attended choir p

ractice

1 answer:

umka21 [38]2 years ago

5 0

Answer:

15 out of 20 is 75% out of 100%

Step-by-step explanation:

20×5=100

15×5=75

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Please help ASAP! Thanks! For the figures below, assume they are made of semicircles, quarter circles and squares. For each shap

bazaltina [42]

Answer:

Part 1) $A=36(\pi-2)\ cm^2$

Part 2) $P=6(\pi+2\sqrt{2})\ cm$

Step-by-step explanation:

Part 1) Find the area

we know that

The area of the shape is equal to the area of a quarter of circle minus the area of an isosceles right triangle

so

$A=\frac{1}{4}\pi r^{2}-\frac{1}{2}(b)(h)$

we have that the base and the height of triangle is equal to the radius of the circle

$r=12\ cm\\b=12\ cm\\h=12\ cm$

substitute

$A=\frac{1}{4}\pi (12)^{2}-\frac{1}{2}(12)(12)$

$A=(36\pi-72)\ cm^2$

simplify

Factor 36

$A=36(\pi-2)\ cm^2$

Part 2) Find the perimeter

The perimeter of the figure is equal to the circumference of a quarter of circle plus the hypotenuse of the right triangle

<em>The circumference of a quarter of circle is equal to</em>

$C=\frac{1}{4}(2\pi r)=\frac{1}{2}\pi r$

substitute the given values

$C=\frac{1}{2}\pi (12)$

$C=6\pi\ cm$

The hypotenuse of right triangle is equal to (applying the Pythagorean Theorem)

$AC=\sqrt{12^2+12^2}$

$AC=\sqrt{288}\ cm$

simplify

$AC=12\sqrt{2}\ cm$

Find the perimeter

$P=(6\pi+12\sqrt{2})\ cm$

simplify

Factor 6

$P=6(\pi+2\sqrt{2})\ cm$

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2 years ago

What is X:<br> |4x−1|=3 <br><br> |x|=−4

Vaselesa [24]

Answer:

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Step-by-step explanation:

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3 years ago

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navik [9.2K]

8=12-8x
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3 years ago

Identify the vertex of the parabola ?

DanielleElmas [232]

Step-by-step explanation:

second one

explanation: trust me bro

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1 year ago

I need help with 1 and 2 please :(

-BARSIC- [3]

Number 1 is 0.3 and number two is 1.25

~hope this helps~

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3 years ago