For problems 4-8, multiply and simplify. 4. 4x' (x2 - 5x-1) 5 . (x - 4) (x+8 ) 6. (x+7)(x+11) 7. (w +6) (w-6) 8 . ( t + 6 ) 2MATH 145 Lab 4.2, 4.3 112022 Members of Group: For Questions 1 - 2, use the following. Source: www.ourworldindata.org The net increase in global population per year changes over time. Between 1977 and 1998, the net rise in population peaked and then declined until 1998 before increasing again. The net increase in global population (in millions) can be approximated by the function P =0.14.t2 +2.98t+73.88 where t is the number of years since 1977. 1. Find the vertical intercept. What is the practical meaning of the vertical intercept in this situation? 2. Use a numerical method to find the year when the net population increase reached 89 million. Show three rows of the table you used to support your answer and write a clear answer to the problem. 3. Use a graphical method to solve the quadratic equation: 10x2 9x 3 = 6 Sketch the graph you used, write down the window, label each graph with its equation, and write a clear answer to the