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vova2212 [387]
2 years ago
13

Easy! what is the area of the circle​

Mathematics
1 answer:
Luden [163]2 years ago
7 0

Answer:

#2

Step-by-step explanation:

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A cylinder with a radius of 1 cm and a height of 21 cm has the same volume as a cone with a height of 7 cm. What is the radius o
Natasha_Volkova [10]

Answer:

<h2>A) 3 cm</h2>

Step-by-step explanation:

The formula of a volume of a cylinder:

V=\pi r^2H

r - radius

H - height

We have r = 1cm and H = 21cm. Substitute:

V=\pi(1^2)(21)=21\pi\ cm^3

The formula of a cone:

V=\dfrac{1}{3}\pi r^2H

r - radius

H - height

We have V = 21π cm³ and H = 7cm. Substitute:

\dfrac{1}{3}\pi(r^2)(7)=21\pi        <em>divide both sides by π</em>

\dfrac{1}{3}(7)(r^2)=21         <em>divide both sides by 7</em>

\dfrac{1}{3}r^2=3         <em>multiply both sides by 3</em>

r^2=9\to r=\sqrt9\\\\r=3\ cm

5 0
2 years ago
Read 2 more answers
what is the value of 8/15÷(-0.35) A -75/14 B -32/21 C -21/32 D -14/75 I would really appreciate it if you could also explain how
barxatty [35]
Answer;-1.5238095238
First step; 8/15

8/15 = 0.53 and so on in a repeating form. (0.53333333333)

Divide; 0.53 / -0.35 

= -1.5238095238

5 0
3 years ago
Read 2 more answers
"You and your friend go to dinner and your total bill is $30. You are both part of the rewards club and have coupons. Your coupo
galben [10]

Answer:

30+30=11

Step-by-step explanation:

so bye

7 0
3 years ago
Find the slope and y intercept of the line in the graph
makvit [3.9K]
SLOPE: 3 Y INTERCEPT: 3
The other answer is not correct!!!
7 0
3 years ago
PLEASEEE. WIll mark brainliest
stepan [7]

Answer:

$625 (but it's really $763.14)

Step-by-step explanation:

Use the formula I=P(1+r)^t

April=25000(1.04)^5=$30416.32

May=25000(1.0375)^6=$31179.46

$31179.46-$30416.32=$763.14

So $625 is the closest answer

5 0
3 years ago
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