What is f(-3) for the function f(a)=-2a2-5a+4?

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day

(x-5)1/2+5=2 what is possible solution of this equation

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?