a) Following are the marks obtained by 20 students of a class in a monthly test of Maths. Present the marks in frequency table and find the mean marks. 60, 50, 40, 80, 50, 70, 50, 70, 80, 70 70, 40. 60, 70, 90. 50, 70, 40, 60. 80

Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)