Find the limit by direct substitution. 9. lim (3x + 5x-7) 10. lim X--2 x+1 x-3x-3x+6 11. lim x3 + 1 X-2 12. lim sinx 3-x 13. lim X- 4.T 3 x-3x-9 X Given f(x) = and g(x) = cos x, find each of the following: 4-x x2 14. lim f(x) 15. lim g(x) x2 16. lim[g(x)f(x)] x-2 17. lim[f(x) = g(x)] x-2 18. You are given 32 inches of wire and are asked to form a rectangle whose area is as large as possible. Determine the dimensions of the rectangle that will produce the maximum area. (ex.1 on 12.1 in your book will help)