Answer:
hope this helps.............
Answer:
c=sqrt21
Step-by-step explanation:
angle c is the angle between a and b, so use the cos law
c^2=a^2+b^2-2*a*b*cosC
c^2= 16+25-2*4*5*1/2
c^2=21
c=sqrt21
X+3y = 14
3y = -x +14
y = -1/3 x +14/3
so the y intercept is 14/3