First, only graph's a and b are linear, meaning the change in each step is the same. This eliminates graphs c and d, which are both exponential.
Next, we need to determine which graph is a negative relationship. In a negative relationship, small values of x mean large values of y and large values of x mean small values of y; this also means the slope is negative. This means graph b has all the properties we're searching for.
15 square meters, hmm...
Your answer is 47.1111
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The coefficiant in the expression is the "c" next to the 2
Is the question multiple choice?
The slope is 2. you can find this by doing the change in y over the change in x