Question

Need help with vectors, really want to understand how to answer questions like these - will give best answer :)

Answer 1

I understand the first one but I cant see why part C is negative r and I have no idea on part D

Answer 2

for D:
http://hotmath.com/hotmath_help/topics/triangle-midsegment-theorem.html

Answer 3

for p, go clockwise:
2r+q/2+p-r-q=0
r-q/2+p=0
p=q/2-r

Answer 4

Thanks for the help! so with D I just remember that if its a midpoint it'll just be 1/2 * the base vector?

Answer 5

How would (b) be done?

Answer 6

The radius of a fully inflated soccer ball is 4.5 inches. After using the ball for a game, the match referee, Jason, measured the ball’s radius and found it had decreased to 4.4 inches.

Ignoring the thickness of the materials the soccer ball is made from, find the volume of the ball before and after the match, and find the difference of the volumes before and after the match. Use π=227.

The approximate volume of the ball before the match is(95.46, 274.36, 381.86, or 406.24) cubic inches. The approximate volume of the ball after the match is (89.24, 321.48, 356.96, or 374.74) cubic inches. The approximate change in the ball’s volume before and after the match is(6.22, 24.90, 31.50, or 47.12) cubic inches.

Answer 7

help?