Question

C?

Answer 1

yeah good

Answer 2

-4

Answer 3

yeah good

Answer 4

B

Answer 5

hm. I got something a little diff.

using law of cosines

c^2 = 42^2 + 35^2 - 2(42)(35)cos(120)
c = ?

Answer 6

D

Answer 7

well done

Answer 8

C

Answer 9

if two vectors have a dot product of 0 they are orthogonal, or in other words, perpendicular (A)

Answer 10

law of cosines as usuall

Answer 11

we only have one side, law of cosines requires 2, so we have to use law of sines

Answer 12

it would be sin a and b right

Answer 13

we don't have angle B or side b so you'd have to use A and a to find side c

Answer 14

Sin (A) / a = Sin (C) / c

Sin (31.6) / 25 = Sin (38) / c

Answer 15

29.374

Answer 16

the angle 31.6 is across from side c so

sin(31.6)/c = sin(38)/25

Answer 17

21.2774

Answer 18

good but they only want 2 decimal places so 21.28

Answer 19

I know its a

Answer 20

i guessed in b

Answer 21

if you multiply c out you will get (4,10) making C also true

so A+B+C

Answer 22

on*