Identify the focus, directrix, an axis of symmetry of (f)x=1/16^2

Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?