Hello, my weak spot is math and I'd someone to solve and explain step by step

9. You purchase a new computer for $ 1800. Its value decreases by 25% each year. a) Determine the decay factor. (A1) Year Value ( $) (n) 1 2 3 4 5 b) Write an equation to represent the value, V dollars of the computer as a function of n, the number of years since you 6 have purchased the computer. (A1) c) Complete the table showing the value of the computer each year for the first six years. (A2) d) Graph the values. Label fully. (A2) e) Use your graph to determine how long it takes the computer to depreciate to half of its value. (A1) f) What will the computer be worth in 10 years? (Al)Thinking 10. There are 3200 bacteria in a culture. The population triples every 20 minutes. a) Write an equation to represent y, the number of bacteria x minutes from now. (T2) b) Estimate how many bacteria there will be in 180 minutes from now. (T2) 11. A radioactive substance has a half-life of 8 days. Suppose you have 120 g of this substance now. a) Write an equation to represent the mass of the substance, y grams, after x half-lives. (T2) b) Use equation in part a) to estimate the mass of the substance 48 days from now. (T2) 12. A radioactive substance has a half-life of 20 seconds. How many half-lives will occur in one and a half hours? (T1)