Question 1? {5 points) Last year, 150 eases were reported of a new infectious disease. It has been predicted that the number will double every year How many oases will he reported in the ninth year? Question 18 {5 points) Which of the following statements is (are) true for all positive integers? 1) n3 + 2a is divisible by 3. 2} 52" 1 is divisible by 24. 0 Both statements are true. 0 None of the statements are true. 0 Only the rst statement is true. 0 Only the seoond statement is true. Question 19 (5 points) Find the sum of the first 5 terms of the geometric series. 8 - 16 + 32 - ... O 87 88 O 89 Question 20 (5 points) Write a recursive formula for finding the ath term of each arithmetic sequence. 15.75, 14.25, 12.75, ... a = 15.75, an = an -1 + 1.5 a = 12.75, an = an -1-1.5 O a1 = 11.25, an = an- 1 + 1.5 O a1 = 15.75, an = an - 1 -1.5