How do i do #27? using trigonometric ratios or inverse

Give me the equations of two lines that have the same slope but are not parallel.

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

Which expression is equivalent to -12(3x-3/4)