Help please! thanks!
Find the length of AB
A. 2.89
B. 33.13
C. 378.63
D. 377.19

Explanation:

Segment AB is already given to be 19 miles long.

I'm assuming your teacher meant to ask about side BC, which is side 'a' since it's opposite angle A.

Use the law of cosines to find the missing side

a^2 = b^2 + c^2 - 2*b*c*cos(A)

a^2 = 12^2 + 19^2 - 2*12*19*cos(138)

a^2 = 843.874040417691

a = sqrt(843.874040417691)

a = 29.0495101579647

a = 29 when rounding to the nearest whole number

Side BC is roughly 29 miles long.

it could 14.28 but if its not that one then it has to be the 17 one. hope this ! : )

step-by-step explanation:

2x^2+5x+17

your welcome. : )