All categories

3 years ago

Help with both pls ty Pls hurry Tysm!!

Mathematics

1 answer:

maksim [4K]3 years ago

5 0

Answer:

1. 98 cm^2

2. 471.25

Step-by-step explanation:

You might be interested in

HELP PICS INCLUDED! WILL GIVE BRAINLIEST! SHOW WORK AND EXPLAIN

Naddik [55]

I assume you know about the dot product, and that for two vectors $\mathbf a$ and $\mathbf b$ , the angle between them $\theta$ satisfies

$\mathbf a\cdot\mathbf b=\|\mathbf a\|\|\mathbf b\|\cos\theta\iff\cos\theta=\dfrac{\mathbf a\cdot\mathbf b}{\|\mathbf a\|\|\mathbf b\|}$

Then the vectors are parallel if the angle between them is 0 or 180 degrees (0 or pi radians), which would make $\cos\theta=1$ or $\cos\theta=-1$ , respectively.

Part A)

$\vec v_1=\langle\sqrt3,1\rangle\implies\|\vec v_1\|=\sqrt{(\sqrt3)^2+1^2}=\sqrt4=2$

$\vec v_2=\langle-\sqrt3,-1\rangle=-\vec v_1\implies\|\vec v_2\|=\|\vec v_1\|=2$

$\vec v_1\cdot\vec v_2=(\sqrt3)(-\sqrt3)+(1)(-1)=-4$

Then the angle between $\vec v_1,\vec v_2$ is such that

$\cos\theta=\dfrac{-4}{(2)(2)}=-1\implies\theta=\pi\,\mathrm{rad}$

so these vectors are parallel ("antiparallel", more specifically, which means they are parallel but point in opposite directions).

Part B) involves the same computations:

$\vec u_1=\langle2,3\rangle\implies\|\vec u_1\|=\sqrt{2^2+3^2}=\sqrt{13}$

$\vec u_2$ has the same components but differing by sign and order, as $\vec u_1$ ; its magnitude remains the same, though:

$\vec u_2=\langle-3,-2\rangle\implies\|\vec u_2\|=\sqrt{(-3)^2+(-2)^2}=\sqrt{13}$

$\vec u_1\cdot\vec u_2=(2)(-3)+(3)(-2)=-12$

$\implies\cos\theta=\dfrac{-12}{(\sqrt{13})(\sqrt{13})}=-\dfrac{12}{13}\implies\theta=\cos^{-1}\left(-\dfrac{12}{13}\right)$

which is neither 0 nor pi, which means these vectors are not parallel.

4 0

4 years ago

Find the slope of the line passing through the points (-9, -2) and (4, -2).<br> slope: 0

SashulF [63]

-13/4 is the slope. :)

4 0

3 years ago

Hi can you help me in mate plis simplify the following algebraic expressions

mars1129 [50]

Answer:

$\frac{3 {x}^{2} }{ {y}^{2} {z}^{6} }$

Step-by-step explanation:

I have attached the explanation above. hopefully this will help

4 0

3 years ago

What is the equation of the line?

Schach [20]

Answer:

$x=-9$

Step-by-step explanation:

5 0

3 years ago

Which is these are ways that identity theft can happen?

WITCHER [35]

Answer: identity theft is not a joke jim

Step-by-step explanation:

sorry i had to ✋

4 0

4 years ago