Quadrilateral ABCD is inscribed in circle O as shown below Which of the following would be used to find the m∠3?

A 90°+m∠4

B 180°−m∠1

C 270°+m∠2

D 360°−(m∠1+m∠2)

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