A function assigns the values. The value a is 11.
<h3>What is a Function?</h3>
A function assigns the value of each element of one set to the other specific element of another set.
The given logarithmic function can be solved as shown below.

Hence, the value a is 11.
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Find the difference between the X and Y values goven:
10 - 1 = 9
12 - 3 = 9
15 - 6 = 9
The difference is 9, so the rule is subtracting 9 from the x value:
y = x -9
Now find Y when x is 20:
y = 20-9
y = 11
Your Answer:
what type of question is this?
You have to know the formula for SA.
<span>SA=2lw+2lh+2wh</span>
Hope this helps
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