Answer:
i know the answer
Step-by-step explanation:
Answer:
No, because an expression is already solved and an equation is where you have to solve it
Step-by-step explanation:
i dont understand the question?
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
