This is my math 186 class homework. I'm in military training that's why I can't do it now

7. Find the center and vertices of 9 x2 + 4 y2 - 18x + 16y - 11 = 0 8. Given the sequence 40, -10, 2.5, -0.625, ... Find the sum of the first 11 terms. 9. The sum of two numbers is 10 and the difference of their squares is 40. Find the two numbers 10. Write the first four terms: an = D. 11. Write the standard form of the hyperbola with vertices at (2, 1) and (-6, 1) and with foci at (4, 1) and (-8, 1). 12. A ball is dropped from a height of 6 feet and begins bouncing. The height of each bounce is 3/4 the height of the previous bounce. Find the total vertical distance the ball travels before coming to a rest