Given C 124 degree B 40 degree and c 15 use the Law and S

Given C = 124 degree, B = 40 degree, and c = 15., use the Law and Sines to solve the triangle for the value of a. Round answer to two decimal places. a) 4.99 b) 19.35 15 c) 6.22 d) 6.43 e) None of these Given u = -4i - 5j, v = -I + 5j. determine -2u - 9v

Solution

(8)

A+B+C=180^o

A+40^o+124^o=180^o

A=16^o

by law of sines a_/sinA=b_/sinB=c_/sinC

a_/sinA=b_/sinB=c_/sinC

a_/sin16^o=b_/sin40^o=15_/sin124^o

a=15sin16^o_/sin124^o

a=4.99

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(9)

u=-4i -5j , v=-i+5j

-2u-9v=-2(-4i -5j) -9(-i+5j)

-2u-9v=(8i +10j) +(9i-45j)

-2u-9v=(17i-35j)