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3 years ago

HELP PLEASE, I don't know what I am doing...

Mathematics

1 answer:

kari74 [83]3 years ago

5 0

I can only jelp u with the first one i think it's going to be 7 because 7*2= 14

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Two points in the Cartesian plane are A(2.00 m, −4.00 m) and B(−3.00 m, 3.00 m). Find the distance between them and their polar

Brrunno [24]

The distance between the two points is $d=8.6m$

The polar coordinate of A is $\left(4.47,296.57\right)$

The polar coordinate of B is $\left(4.24,135\right)$

Explanation:

The two points are $A(2,-4)$ and $B(-3,3)$

The distance between two points is given by,

$d=\sqrt{(2+3)^{2}+(-4-3)^{2}}\\d=\sqrt{(5)^{2}+(-7)^{2}}\\d=\sqrt{25+49}\\d=8.6$

Thus, the distance between the two points is $d=8.6m$

The polar coordinates of A can be written as $(Distance, tan^{-1} \frac{y}{x} )$

Distance = $\sqrt{x^{2} +y^{2} }$

Substituting $A(2,-4)$ , we get,

Distance = $\sqrt{2^{2} +(-4)^{2} }=\sqrt{4+16 }=4.47$

$tan^{-1} \frac{y}{x} =tan^{-1} \frac{-4}{2}=-63.43$

To make the angle positive, let us add 360,

$\theta=360-63.43=296.57$

The polar coordinate of A is $\left(4.47,296.57\right)$

Similarly, The polar coordinate of B can be written as $(Distance, tan^{-1} \frac{y}{x} )$

Distance = $\sqrt{x^{2} +y^{2} }$

Substituting $B(-3,3)$ , we get,

Distance = $\sqrt{(3)^{2}+(3)^{2}}=4.24$

$tan^{-1} \frac{y}{x} =tan^{-1} \frac{3}{-3}=-45$

To make the angle positive, let us add 360,

$\theta=180-45=135^{\circ}$

The polar coordinate of B is $\left(4.24,135\right)$

5 0

3 years ago

How can elimination and substitution adapt to solve a system with nonlinear equations?

GenaCL600 [577]

Even tho you did me dirty i will answer you.
You can subtract the whole number

8 0

3 years ago

Evaluate: 2/3 x 1 *Write your answer in fraction form.*

alina1380 [7]

Answer:

its just 2/3 lol

Step-by-step explanation:

2/3 x 1 is 2/3

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3 years ago

Drag each label to the correct location on the image.

eduard

Answer:

See below

Step-by-step explanation:

Given numbers:

5.91E10
0.0000734
2.66 x 10^-3
641,000,000,000

Standard notation:

0.0000734
641,000,000,000

Scientific Notation:

5.91E10
2.66 x 10^-3

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A cubic box that holds 125 units

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