PLEASE HELP!!

Mathematics

1 answer:

kobusy [5.1K]3 years ago

5 0

Answer:

The average height of a 5-year-old boy is $98.9\ cm$

Step-by-step explanation:

Let

x------> the ages of boys between 2 and 10 years old

y-----> the average heights in centimeters

we have

$y=6.3x+67.4$

For $x=5$ year-old-boy

substitute in the equation the value of x to find the value of y

$y=6.3(5)+67.4=98.9\ cm$

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Given that,

An oil company fills 1 over 10 of a tank in 1 over 5 hour.

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Solution,

Let it takes t time to fill the tank completely. It can be calculated as follows :

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