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2 years ago

Kevan is 6 years younger than Katie. Melanie is twice as old as Kevan. How old are all three siblings?

Mathematics

2 answers:

Andrei [34K]2 years ago

7 0

Kevan is 8
katie is 14
Melanie is 16

I think this is the answer.

ruslelena [56]2 years ago

3 0

Let's start by narrowing it down to make it simpler:

Kevin is 6 years younger than Katie

Melanie is twice as old as Kevin.

So, to start off with, Melanie is twice as old as Kevin. That would make Melanie 12 years old, and Kevin 6 years old. I'm not too sure about Katie, however. But this is what I got:

Kevin: 6 years old
Melanie: 12 years old
Katie: ?

Hopefully that helped a little! :)

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Answer:

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Step-by-step explanation:

To find the average rate of change of a function over a given interval, basically you need to find the slope. The mathematical definition of the slope is very similar to the one we use every day. In mathematics, the slope is the relationship between the vertical and horizontal changes between two points on a surface or a line. In this sense, the slope can be found using the following expression:

$Average\hspace{3}rate\hspace{3}of\hspace{3}change=Slope=\frac{y_2-y_1}{x_2-x_1} =\frac{f(x_2)-f(x_1)}{x_2-x_1}$

So, the average rate of change of:

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$f(x_2)=f(3)=-(3)^2+3(3)+6=-9+9+6=6\\\\f(x_1)=f(-3)=-(-3)^2+3(-3)+6=-9-9+6=-12$

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