2 years ago

What is 2x + 5 (y-1) when x=8 and y=5

Mathematics

2 answers:

Neko [114]2 years ago

8 0

Step-by-step explanation:

2x + 5 (y-1)

16+20

=36

hope it helps you

OverLord2011 [107]2 years ago

5 0

36
just replace the variables and then subtract then multiply

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Maksim231197 [3]

Step-by-step explanation:

The angle between vectors is given by

$\cos{\theta} = \dfrac{\vec{\textbf{a}}\cdot \vec{\textbf{b}}}{|\vec{\textbf{a}}||\vec{\textbf{b}}|}$

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$|\vec{\textbf{a}}| = \sqrt{a_x^2 + a_y^2 + a_z^2}$

$\:\:\:\:\:\:\:=\sqrt{(2)^2 +(-5)^2 + (3)^2} = 6.16$

$|\vec{\textbf{b}}| = \sqrt{b_x^2 + b_y^2 + b_z^2}$

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The dot product between the vectors is

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Therefore, the angle between the two vectors is

$\cos{\theta} = \dfrac{\vec{\textbf{a}}\cdot \vec{\textbf{b}}}{|\vec{\textbf{a}}||\vec{\textbf{b}}|} = \dfrac{13}{(6.16)(5.10)}$

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