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saul85 [17]
3 years ago
14

please calculate the volume of the cylinder below. use 3.14 as approximation for Pi. (MIDDLE SCHOOL MATH)​

Mathematics
1 answer:
Gnom [1K]3 years ago
3 0

the answer is V≈254.47

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We have a jar of coins, all pennies and dimes. All together, we have 309 coins, and the total value of all coins in the jar is $
Vinvika [58]

There are 130 pennies in the jar

Step-by-step explanation:

We have a jar of coins

  • All coins are pennies and dimes
  • There are 309 coins in the jar
  • The total value of all coins in the jar is $ 19.2

We need to find the number of pennies in the jar

Assume that there are p pennies and d dimes in the jar

∵ There are p pennies and d dimes in the jar

∵ There are 309 coins in the jar

∵ All the coins in the jar are pennies and dimes

∴ p + d = 309 ⇒ (1)

∵ The total value of all coins in the jar is $ 19.2

∵ $1 = 100 cents

∴ $19.2 = 19.2 × 100 = 1920 cents

∵ 1 penny = 1 cent

∵ 1 dime = 10 cents

∴ p + 10 d = 1920 ⇒ (2)

Now we have system of equations, we can solve them to find p

∵ p + d = 309 ⇒ (1)

∵ p + 10 d = 1920 ⇒ (2)

- Multiply equation (1) by -10 to eliminate d

∵ (-10)(p) + (-10)(d) = (-10)(309)

∴ -10 p - 10 d = -3090 ⇒ (3)

Add equations (2) , (3)

∴ -9 p = -1170

- Divide both sides by -9

∴ p = 130

There are 130 pennies in the jar

Learn more:

You can learn more about the system of equations in brainly.com/question/3739260

#LearnwithBrainly

8 0
3 years ago
B/c = x/b<br> solve for (x)(c)
Anettt [7]

Answer:

Hi! The correct answer is x=b^2/c, c=b^2/x

Step-by-step explanation:

<em><u>~Solve the rational equation by combining expressions and isolating the variable c and b~  </u></em>

6 0
3 years ago
If i round 4,180 to the nearest thousand what will it be
dybincka [34]
The answer would be 4,000

6 0
3 years ago
Choose the phrase that best describes the matrix
lions [1.4K]

Answer:

coefficent matrix

Step-by-step explanation:

P. 366

"If the column of constant terms is not included, the matrix reduces to that of the coefficent matrix of the system"

-1 -3 -1

9 -9 -1

-1 -3 4

7 0
3 years ago
Read 2 more answers
Given that m/_a=40 and m/_b=61 find that the measure of angles x and y
brilliants [131]
Answer:
y = 140, x = 159
Step-by-step explanation:
Angle y:
we can find this angle by subtracting 40 from 180, 180-40 = 140 = y
Angle x:
Some measure of an angle plus angle b is equal to 180 degrees: 180-61 = 119
We can now find the measure of the third angle of the triangle: 180-(119+40) = 21
The third angle plus angle x is equal to 180: 180-21 = 159 = x
7 0
1 year ago
Read 2 more answers
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