39/40 as a decimal is 0.975
By using the rule -b/2a —> 12/-6= -2
You turn them into improper fractions by multiplying the bottom number to the whole number then adding the product to the top of the fraction, therefore
3 1/3 = 10/3, and 1 2/3 = 5/3
10 _ 5 = 5/3
3 3
The first one. A is the answer
