What are the answers for these questions 1,2,& 3

Select the number of ways in which a line and a circle can intersect

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

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955