Please answer this question

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

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

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w