(10x - 4) + ( -7 + x) = (10x +) + ( -4 + )

Fimd the missing numbers

Solve for x i'll try to attach the files bc it's not letting me for some reason

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

Use the given information to determine the exact trigonometric value.