Verified answer

0.075 = 75/1000 = 3/40 or (0.075) = 0.75/10 = (3/4)(1/10) = 3/40

To add you need common denominators: 30/40 + 3/ 40 = 33/40

as decimals 0.75 + 0.075 = 0.825

0.75 = 75 / 100 = 3 / 4

0.075 = 75 / 1000 = 3 / 40

when added together

3 / 4 + 3 / 40 = 30 / 40 + 3 / 40 = 33 / 40

0.075 = 3/40

3/4 + 3/40 = 34/40 = 17/20