To multiply 2 5/8 x 1 3/7, you must change the mixed numbers to which of these?

a 21/8 x 7/10
b 21/8 x 10/7
c 7/8 x 4/7
d 3 x 8/15

thx

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old