12. in the adjacent figure, abcd is a square such that abo is an
equilateral triangle. find:
b. reflex aoc
4. bco

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

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums. what is the probability that the applicant who gets the job plays drums or guitar?

8.74 rounded to the nearest whole number