Show work and explain with formulas.

find the first four terms of the sequence if a_1 = 9, a_n = 5(a_n-1) - 7

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?

For each given situation, determine if the method of randomization is either appropriate or not appropriate