Given r1 = 3i - 2j + k, r2 = 2i - 4j - 3k, r3 = -I + 2j + 2k, find the magnitudes of (a)r3.

(b)r1 + r2 + r3.

(c)2r1 - 3r2 - 5r3

​

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.