3 years ago

I NEED HELP PLEASE, THANKS! :)

Mathematics

1 answer:

natka813 [3]3 years ago

3 0

Answer:

Step-by-step explanation:

Cos θ =<u> u*v </u>

IuI *IvI

u * v = 7*(-1) + (-2)*2

= -7 - 4

= -11

IuI = $\sqrt{7^{2}+(-2)^{2}}\\$

= $\sqrt{49+4}\\\\$

= $\sqrt{53}$

I vI = $\sqrt{(-1)^{2}+2^{2}}\\$

= $\sqrt{1+4}\\\\$

= $\sqrt{5}\\$

Cos θ = $\frac{-11}{\sqrt{53}*\sqrt{5} } \\\\$

= $\frac{-11}{16.28}\\\\$

Cos θ = -0.68

θ = 132.5°

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