Question

PLEASE HURRY 100 POINTS!

Marques made a mistake when solving this problem. On what line did he make the error?
A) Line 1
B) Line 2
C) Line 3
D) Line 4
E) Line 5

Answer 1

Use law of cosines

• c²=a²+b²-2abcosC
• c²=14²+8²-2(14)(8)cos80
• c²=196+64-244(0.173)
• c²=221.1
• c=14.87

Error at line 2

Answer 2

B) Line 2

using the formula:

`\sf c^2 = a^2 + b^2 -2abcos(C)`

`\sf c^2 = 14^2 + 8^2 -2(14)(8)cos(80)`

`\sf c^2 = 196 + 64 -244 *0.173`

`\sf c^2 = 221.1`

`\sf √(c) = √(221.1)`

`\sf c = 14.87`