3. C(8, r) = 28; r =​

Given:

To find:

The value of r.

Solution:

Combination formula:

We have,

Using the combination formula, we get

It can be written as:

Case 1:

And,

Case 2:

And,

Therefore, the value of r is either 2 or 6.

i would have to say it is c.

step-by-step explanation:

if you meant, "on the way from (3, 2) to (3, 14):

x does not change; y increases by 12.

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