answer questions 16 17 and 18 please!

S 16. In 2003, the number, N, of cases of SARS (Severe Acute Respiratory Syndrome) reported in Hong Kong's was ini- tially approximated by N = 78.9 + 30.1t, where t is the number of days since March 17. Interpret the constants 78.9 and 30.1. last 17. A new Toyota RAV4 costs $23,500. The car's value de- preciates linearly to $18,823 in three years time. 16 Write a formula which expresses its value, V, in terms of its age, t, in years. 18. In 2012, the population of a town was 21,510 and growing by 63 people per year. Find a formula for P, the town's population, in terms of t, the number of years since 2012