What is the answer for this please help fast!?

Which statements regarding the diagram are true? check all that apply.

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

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of