Answer:
B
Explanation:
B shows not only the correct numbers for breakfasts and lunches purchased but also is very clear that the 6 7 and 8 are grades, not more unknown foods bought.
here
Step-by-step explanation:
Answer = <span><span><span><span>12<span>x3</span></span>−<span>7<span>x2</span></span></span>+<span>9x</span></span>−<span>2</span></span>
solution:
we know that ,
u.v = ΙuΙ ΙvΙcosθ
here,
θ =60° (since the given triangle is equilateral triangle)
u.v = ΙuΙ ΙvΙcos60°
= 1 x 1 x 1/2
u.v = 1/2
now, u.w = ΙuΙ ΙwΙcosθ
= ΙuΙ x cos(60x2)
u.w = -1/2
