computer monitor has a height of 12 inches with a diagonal measurement of 20 inches. How many inches wide is the rectangular screen?

Question

zpupster · Answer

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do you know the Pythagorean theorem???

anonymous · Answer

no i do not please help

zpupster · Answer

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Pythagorean theorem states 
 a^2 + b^2 = c^2

zpupster · Answer

ok I will walk you through your problem.

x^2 +  (12)^2 = (20)^2 expanding
the known squares

x^2 + 144 = 400
now subtract 144  from both sides

x^2 =  256
now take the square root both sides

x = 16

our width is 16

anonymous · Answer

please help me with this one  
Find the hypotenuse of a right triangle with legs of 9 inches and 12 inches

anonymous · Answer

is  it 7?

zpupster · Answer

no

use the the theorem 
look at the triangle I drew
c is the hypontenuse 

(9 ) + (12) = c^2
81 + 144 =c^2
?=c

anonymous · Answer

50,625?

zpupster · Answer

on oyur calculator add 81 + 144
when you get that answer

take the square root

anonymous · Answer

15

zpupster · Answer

good job!!!!!!!!!!!!!!!!!

anonymous · Answer

thanks you have no idea how appreciative i am of your help