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3 years ago

What is the surface area of a cone with a diameter of 28 cm. and height 22 cm in terms of Ï.

Mathematics

1 answer:

Svetlanka [38]3 years ago

5 0

To find the surface area of a cone, use this formula.

pi (r) (r + [square root of h^2 plus r^2] ) substitute

h = height = 22 r = radius = 28/2 = 14 [ ] = sq. root

pi (14) (14 + [ 22^2 + 14^2 ]) solve exponents

pi (14) (14 + [484 + 196]) add

pi (14) (14 + [680]) solve square root

pi (14) (14 + 2[170]) add

pi (14) (40.0768) multiply

pi (561.075) is about 561.1 rounded to nearest tenth

So the answer is C. 561.1pi cm^2

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mars1129 [50]

Answer:

The absolute change in the height of the water is 9.5 inches

Step-by-step explanation:

Given

$l =24in$ --- length

$w = 15in$ --- width

$h =12in$ --- height

$V_1 = 900in^3$ --- the volume removed

Required

The absolute change in the height of the water

First, calculate the base area (b):

$b = l * w$

$b =24in * 15in$

$b =360in^2$

The height of the water that was removed is:

$H = \frac{V_1}{b}$ i.e. the volume of the water removed divided by the base area

$H = \frac{900in^3}{360in^2}$

$H = \frac{900in}{360}$

$H = 2.5in$

The absolute change in height is:

$\triangle H = |h - H|$

$\triangle H = |12in - 2.5in|$

$\triangle H = |9.5in|$

$\triangle H = 9.5in$

8 0

2 years ago

17+4h+2=1-5h what does the variable equal ?

olga2289 [7]

1. 17+4h+2=1-5h
2. 19+4h=1-5h
3. 18+4h=-5h
4. 18=-9h
5. -2=h

5 0

3 years ago

If the angles of a quadrilateral are 140, 80, 60, 80 then what type of quadrilateral could it be?

Lubov Fominskaja [6]

Im sorry but, a friend told it was a rectangle, im sure if thats a good enough answer but if it isn't im sorry

3 0

3 years ago

Read 2 more answers

Answer this question. You get a thank you and 5 stars if it's the correct answer.

Elena L [17]

Answer:

w=5

x=7

y=6

z=12

Step-by-step explanation:

hope this helps you

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2 years ago

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The company Drug Test Success provides a "1-Panel-THC" test for marihuana usage. Among 300 tested subjects, results from 27 subj

Sindrei [870]

Answer:

There is evidence for the claim that less than 10% of the test results are wrong

Step-by-step explanation:

Given that the company Drug Test Success provides a "1-Panel-THC" test for marihuana usage.

Among 300 tested subjects, results from 27 subjects were wrong (either a false positive or a false negative.)

Sample proportion = $\frac{27}{300} \\=0.09$

H0: p = 0.10

Ha: p <0.10

(left tailed test)

p difference = 0.09-0.10 = -0.01

Std error = $\sqrt{0.1*0.9/300} \\=0.005196$

z statistic = -1.9245

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Since p <0.05 we reject H0

There is evidence for the claim that less than 10% of the test results are wrong

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3 years ago