what is the best estimate for 1/12 + 1/20 ansers are 0 1 and 1/2

The best estimate for 1/12 + 1/20 is approximately 0.92 or 1.

Select all the common denominators for 14 and 710 . ansers 10 20 24 32 and 40 there are multipule ansers

The common denominators for 14 and 710 are 20, 40, 60, 80, 100, and so on.

instead of 14 and 710 i ment 1/4 and 7/10

Apologies for the confusion. The common denominator for 1/4 and 7/10 is 20.

there were multiple correct ansers

You're right, and I apologize for not mentioning that. In addition to 20, other common denominators for 1/4 and 7/10 include 40, 60, 80, 100, and so on.