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Serjik [45]
2 years ago
14

5 pencils and 4 crayons are 19.6 inches. 6 pencils and 5 crayons are 23.8 inches. Each pencil is the same length as the other pe

ncils, and each crayon is the same length as the other crayons. What is the length of 1 pencil? What is the length of 1 crayon?
Mathematics
1 answer:
sweet [91]2 years ago
8 0

Answer:

The length of 1 pencil is 2.8 inches and the length of 1 crayon is 1.4 inches

Step-by-step explanation:

Let the length of one pencil be p.

Let the length of one crayon be c.

5 pencils and 4 crayons are 19.6 inches. Therefore:

5p + 4c = 19.6 ___________ (1)

6 pencils and 5 crayons are 23.8 inches. Therefore:

6p + 5c = 23.8 ___________ (2)

We now have two simultaneous equations:

5p + 4c = 19.6 ___________ (1)

6p + 5c = 23.8 ___________(2)

Multiply (1) by 6 and (2) by 5, we have:

30p + 24c = 117.6 _________(3)

30p + 25c = 119 __________ (4)

Subtract (3) from (4), we have:

30p + 25c - (30p + 24c) = 119 - 117.6

30p - 30p + 25c - 24c = 1.4

=> c = 1.4 inches

Put the value of c in (1), we have:

5p + 4(1.4) = 19.6

5p + 5.6 = 19.6

=> 5p = 19.6 - 5.6

5p = 14

p = 14 / 5

p = 2.8 inches

The length of 1 pencil is 2.8 inches and the length of 1 crayon is 1.4 inches.

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The height of the baseball after the 1.5 seconds of time as the boy throw the ball is 15.5 meters.

<h3>How to model a mathematical function?</h3>

The mathematical functions is used to represent the general problem in the mathematical way to solve them.

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A boy throws a baseball across a field. The ball reaches its maximum height, 18 meters, after 1 second.

After approximately 2.3 seconds, the ball lands on the ground.

The ball’s motion can be modeled using the function

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As, the height of the ball 1.5 seconds after it is thrown has to be found out. Thus, put the values of in the above equation as,

f(x) = -10(1.5)^2 +20(1.5)+ 8\\f(x)=-22.5+30+8\\f(x)=15.5\rm \; m

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Learn more about the modeling the mathematical function here;

brainly.com/question/25896797

3 0
2 years ago
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eimsori [14]
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