Calculus 2

Please answer the questions correctly. Please type the answers. Thank you.

6. [-/1 Points] DETAILS SCALCET9 10.2.075. 0/100 Submissions Used MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the surface area generated by rotating the given curve about the y-axis. x = 3t2, y = 2ts, osts 1 Need Help? Read It Watch It Submit Answer 7. [-/1 Points] DETAILS SCALCET9 10.2.015. 0/100 Submissions Used MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find and dzy dx dx 2 x = t2 + 8, y = t2 + 5t dy dx day dx 2 For which values of t is the curve concave upward? (Enter your answer using interval notation.) Need Help? Read It Watch It Submit Answer8. [-/1 Points] DETAILS SCALCET9 10.XP.2.011. 0/100 Submissions Used MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the following. x = 3 sin(t), y = 4 cos(t), 0