Ok the ladder and the ground will make a right triangle/right angle. This is because the ground is flat, the wall is straight and only the ladder is leaning/slanted. I hope this helps.
2x^2 - 8 = 0
2x^2 = 8
x^2 = 8/2 = 4
x = sqrt(4) = 2 or -2
D) La camisa roja y el pantalon negro
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1 cm = 10mm
5 mm : 10mm : :1 : 2
hoped i helped. ^-^
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Again, decimals and fractions represent all the values in between integers. Decimals are simply one step more of simplification from fractions.