3 years ago

PLZZZ help with this its pretty simple!

Mathematics

2 answers:

Zolol [24]3 years ago

7 0

Answer:

Step-by-step explanation:

hope this helps

My name is Ann [436]3 years ago

3 0

Answer:

D) 4x² - 9

Step-by-step explanation:

(2x + 3)(2x - 3)

4x² - 6x + 6x - 9

4x² - 9

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iragen [17]

Oh my god why so long

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3 years ago

Answer me this it isn't very hard 17+4x= 43+x<br> find x i didnt even find this out but go ahead

irakobra [83]

Answer: X = 8.67

Step-by-step explanation:

4 0

3 years ago

Find the two numbers if the sum is 13 and the difference is 4

Sonja [21]

The answer is 17 and 9
Because 13-4=9 13+4=17

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3 years ago

If a windshield wiper covers an area of approximately 160 square inches when it rotates at an angle of 84°, find the length of t

sergey [27]

General Idea:

We can use the below formula to find the area of sector (A), when angle of sector and radius is given:

$A=\frac{\theta}{360} \cdot \pi \cdot r^2$

Applying the concept:

We need to substitute 84 for $\theta$ and 160 for A in the above formula:

$160 = \frac{84}{360} \cdot \pi \cdot r^2\\ Solving \; for \; r\\ \\ \frac{84\pi}{360} \cdot r^2=160\\ Multiply \; the \;reciprocal\; \frac{360}{84\pi} \;on\;both\;sides\;of\;the\;equation\\ \\ r^2=160\cdot \frac{360}{84\pi} \\ \\ r^2=\frac{57600}{84\pi} \\Taking \;square\;root\;on\;both\;sides\\ r=\sqrt{\frac{57600}{84\pi}} \approx14.8\; inch$

Conclusion:

If a windshield wiper covers an area of approximately 160 square inches when it rotates at an angle of 84°, the length of the wiper to the nearest tenth of an inch is <u>14.8</u>

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3 years ago

Let u = <-9,4>, v = <8, -5>. Find u - v.

OLEGan [10]

I am guessing vectors :)

(-17, 9)

or in polar form

√370, -27°53'50"

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3 years ago