Mathematics: Pls help these are the last two questions I need pls help!

-7a + 5a -(7-a) -(2a +1) Turns to -7a +5a -7 +a -2a -1 Which turns to -2a -1a -8 Which turns to -1a -8 Which turns to 1a 8 :)...

Pls help these are the last two questions I need pls

Emilybaez15

18.01.2022

(#5) x = 13

#6) N = 55

Step-by-step explanation:

(5). Hypotenuse = x

Using Pythagoras theorem , we have :

$x^{2} = 12^{2}+5^{2}$

$x^{2} = 144 + 25$

$x^{2} = 169$

x = 13

(6) hypotenuse = 73 , therefore :

$73^{2}=48^{2}+N^{2}$

$5329= 2304 + N^{2}$

Therefore :

$N^{2}= 5329 - 2304$

$N^{2}=3025$

N = 55

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