What’s the best and fastest way to do practise test 3, section 3, question 15? How would you interpret the equation? (which I find very confusing and difficult)

Thank you

If the equation is confusing for you, try plugging in! The three statements you’re evaluating are about 1 degree increases, so plug in 0 and 1 for *F* and see what happens to *C*. Then plug in 0 and 1 for *C* and see what happens to *F*.

That tells you that a 1 degree increase in *F* results in a increase in *C*.

Because , that tells you that a 1 degree increase in C results in a 1.8 degree increase in F.

That’s enough to choose choice D.