Given that y=kx and y=7 when x=9 calculate: A. the value of k (3mark B. the value of y when x=36 (2mark Question 6 A. The basic wage rate for Tom, a technician, for a 42-hour week is $36.40 per hour. Calculate Tom's weekly salary. (1 mark B. For overtime work, Tom is paid one and a half times the basic hourly rate. Calculate Tom's total wage for 58 hours of work. (3 marks C. Another technician, John, is paid $1490.00 for 36 hours of work. Calculate John's hourl rate of pay. (1 mark Question 7 Sanya invested $7800 in a retirement account. The interest rate is 5% per annum. Calculate: A. the simple interest earned on the investment at the end of 18 months. (3 marks B. the total amount in her account at the end of the 18 months. (2 marks)