Question

In the formula D = 1 ÷ f, if f is equal to -0.025, then D is equal to

Answer 1

The answer is D= -40
I’m assuming that you can’t use a calculator in my work:

To solve this I changed the decimal -0.025 into a fraction .25 equals 1/4 so -0.025 must equal negative 1/40. -1/(1/40) equals -40