Help me with these please

Acircle has a circumference of 7.850 units. what is its radius?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c

Yolanda wanted to buy a total of 6 pounds of mixed nuts and dried fruit for a party she paid 21.60 for mixed nuts and 11.90 for dried fruit did yolanda but enough mixed nuts and dried fruit for the party