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coldgirl [10]
3 years ago
9

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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2 years ago
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Cos(x+y)/cos(x)sin(y)=cot(y)-tan(x)
zhuklara [117]
So there is an identity we'll need to use to solve this:

cos(x+y) = cosxcosy - sinxsiny

replace the numerator with the right hand side of that identity and we get:

(cosxcosy - sinxsiny)/cosxsiny

Separate the numerator into 2 fractions and we get:

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the cosx's cancel on the left fraction, the siny's cancel on the right fraction and we're left with:

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7 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]

<u>the question is </u> 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

<u>Find the mass of copper in the coin</u>

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

<u>Find the cost</u>

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

<u>the answer is</u>

$0.02

3 0
3 years ago
Solve the equation for the specified variable. P= V-I/S. For I.
notsponge [240]
Changing the subject of the formula

6 0
3 years ago
What are the following expressions that are equivalent to 0.25.
wlad13 [49]

Answer:

Step-by-step explanation:

0.25=25/100=1/4

4 0
3 years ago
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