Answer:
328
Step-by-step explanation:
Answer:
Maria did her job properly. Both gears are perpendicular.
Step-by-step explanation:
Recall that given vectors a and b, they are perpendicular if and only if
=0. If
. Then
.
IN our case a=(5,-1,2) and b) (1,-3,-4). So,

So both gears are perpendicular.
Answer:
54 stitches
Step-by-step explanation:
Dodd's knitting is (12 stitches)/(2 inches) = 6 stitches per inch. Then in a width of 9 inches, there will be ...
(9 inches)(6 stitches/inch) = 54 stitches