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3 years ago

I need ASAP!! Find CU. If necessary, round answers to 4 decimal places

Mathematics

1 answer:

MA_775_DIABLO [31]3 years ago

5 0

Answer:

The correct answer for this equational ratio is x = 5

Step-by-step explanation:

In order to calculate for x, we must create the necessary ratios

$\frac{16}{20} = \frac{45-5x}{5x}$

Cross multiply to get

900 - 100x = 80x

900 = 180x

x = 5

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So there is an identity we'll need to use to solve this:

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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

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we know that

the market price of the copper is $2.15 per pound

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convert gram to pounds

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therefore

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$0.02

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wlad13 [49]

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