Please answer from 7-11. It's for Grade 11 Pre Cal.

In a geometric sequence the sum of the first six terms is 9 times the sum of the first three terms. If the first term is 5, what is the third term? 8) Find the first term of the sequence 5, 10, 20, 40,.... which exceeds 10000. 9) The sum of the first three terms of a convergent geometric series is 19. The sum of the series is 27. Find the first term and the common ratio. 10) Suppose that you are responsible for predicting the cost of constructing a new multi-story office building. The cost per square meter of floor space for constructing the higher stories increases because it is more difficult to build them. a) You find that the first story costs $400 per square meter, and the fifth story costs $500 per square meter. Assuming that the cost per square meter form an arithmetic sequence, find the common difference. b) What is the cost per square meter for the second and third floors? c) The building is 48 stories high. How much per square meter will the top story cost? d) If each story is to have 1000 square meters of floor space, what is the total cost of the building? 1 1) A super rubber ball is dropped from a height of 12m. It bounces back 80% of the distance after each previous bounce. a) How high did the ball bounce when after it had touched the ball the 6th time? b) How much has the ball traveled when it touches the ground for the fourth time? c) If the ball continues to bounce forever what is the maximum distance it can travel? let 1 D