Contains the point (5, 4) and is perpendicular to the y axis

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 of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

Solve for x and select the correct answer