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3 years ago

Please help me i need an answer

Mathematics

2 answers:

Nataly_w [17]3 years ago

4 0

The correct answer is 42, sir/ma'am

victus00 [196]3 years ago

4 0

Well a rectangle has 4 sides and so 144 divided by 30 is 4.8 which is the closest to 4 so 30in would be he answer

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What is the volume of a cone with a diameter of 16 centimeters and a height of 15 centimeters?

AleksAgata [21]

Answer:

The correct answer is 8cm.

Step-by-step explanation:

Vol. Of cone= 1/3pi r²h

= 1/3×3.14× 8²×15

= 8×8×5×3.14

64× 5×3.14

= 320×314/100

=16×314=5024 cm³

Hope this helps:) Goodluck!

7 0

2 years ago

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Johnny took the math test and got 20 out of 25 qustions correct; what grade did Johnny make on the test?

meriva

Answer:

B: 80%

Step-by-step explanation:

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3 years ago

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Find c such that (−3,−8), (−7,−6), and (c,4) lie on a line.

bearhunter [10]

If the 3 points are collinear, then the slopes of all line segments connecting the points are the same.

Thus,

-6 - (-8) 2
m = ------------- = -------- = -1/2
-7 - (-3) -4

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4-(-6) 10
-1/2 = ------------ = ---------
c - (-7) c + 7

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7 0

3 years ago

100 POINTS! SOLVE FOR X. PIC ATTACHED. Random answers will be reported.

Romashka-Z-Leto [24]

Answer:

x = 29

Step-by-step explanation:

The angles (2x- 10) and (4x+ 16) are consecutive interior angles and therefore are corresponding

Corresponding angles sum to 180

(2x - 10) + (4x + 16) = 180
6x + 6 = 180
6x = 174
x = 174/6
x = 29

8 0

3 years ago

"a u.S. 1-cent coin (a penny) has a diameter of 19 mm and a thickness of 1.5 mm". Assume the coin is made of pure copper, whose

choli [55]

the question is Calculate the value of the copper in the coin

Step 1

Find the volume of the coin

we know that

the volume of a cylinder is equal to

$V=\pi r^{2}h$

where

r is the radius of the coin

h is the thickness of the coin

in this problem we have

Diameter=19 mm=1.9 cm

r=D/2------> r=1.9/2=0.95 cm

h=1.5 mm=0.15 cm

substitute the values in the formula

$V=\pi*0.95^{2}*0.15=0.425\ cm^{3}$

Step 2

Find the mass of copper in the coin

we know that

the density is equal to

$Density=mass/volume$

Solve for the mass

$mass=Density*volume$

we have

$Density=8.9\ gr/cm^{3}\\Volume=0.425\ cm^{3}$

substitute in the formula

$mass=8.9*0.425=3.785\ gr$

Step 3

Find the cost

we know that

the market price of the copper is $2.15 per pound

1 pound=453.592 grams

convert gram to pounds

3.785 gr=3.785/453.592=0.0083 pounds

0.0083*$2.15=$0.018=$0.02

therefore

the answer is

$0.02

3 0

4 years ago