Please help! literally desperate for help asap!

What point is the projection of q on a) r b) s c) t

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

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