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vladimir2022 [97]3 years ago

7 0

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In ∆PQR, PQ = 39 cm and PN is an altitude. Find PR if QN = 36 cm and RN = 8 cm.

OLEGan [10]

Use the Pythagorean theorem two times:

$NQ^2+NP^2=QP^2\\\\36^2+h^2=39^2\\\\1296+h^2=1521\qquad\text{subtract 1521 from both sides}\\\\h^2=225\to h=\sqrt{225}\\\\\boxed{h=15\ cm}$

second time:

$PR^2=RN^2+NP^2\\\\x^2=8^2+15^2\\\\x^2=64+225\\\\x^2=289\to x=\sqrt{289}\\\\\boxed{x=17\ cm}$

<h3>Answer: PR = 17 cm.</h3>

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3 years ago

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Solve the equation<br> z/6 = 1/6<br><br>A. z= -36<br>B. z= 0<br>C. z= 1<br>D. z= 36

Elan Coil [88]

B B B

B is the correct answer

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3 years ago

— 8х + 3y = 17<br> 8x — 9y = — 19

bija089 [108]

Answer:

x= 83y−17 and y= 83x+17

hope it helps

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5 is 20% of what number

Georgia [21]

Five is twenty % of twenty-five

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4 years ago

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Brilliant_brown [7]

640 u can thank me later

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