In 1/a-b - 1/b-a
Why do we multiply the fraction by -1 to get the common denominator?
I factorised the denominators and got the wrong answer.
The answer is 2/a-b
Please explain, thank you

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

5. which description does not guarantee that a quadrilateral is a squar ajo is a parallelogram with perpendicular diagonals 0% has all sides congruent and all angles congruent o has all right angles and has all sides congruent 10% is both a rectangle and a rhombus 30%