6. Which of the following quadratic equation canbe easily solved by extracting the square roots? aligned 21=0\\ ;=0 aligned a. x ^ 2 - 4x - 21 = 0 b. 4x ^ 2 - 25 = 0 c. 3x ^ 2 - 6x - 21 = 0 d. x ^ 2 + 9x + 18 = 0

ummm seems that u didnt post the attachement !

he has now walked a total of what?

if i know what this is maybe i can

step-by-step explanation:

66.666666667%

step-by-step explanation:

divide 150 by 100

divide 100 by 1.5

there you go!

decreased by 33.333333334%

< xcy ≅ < xby

step-by-step explanation:

in δcax and δbax,

so, δcax ≅ δbax (side-angle-side or sas)

since δcax ≅ δbax, we can conclude < acx ≅ < abx

in δacy and δaby,

so, δacy ≅ δaby (side-angle-side or sas)

since δacy ≅ δaby, we can conclude < acy ≅ < aby

now,

< acy ≅ < aby

=> < acx + < xcy ≅ < abx + < xby

=> < acx + < xcy ≅ < acx + < xby   (since < acx ≅ < abx already proved above)

subtracting < acx from both sides, we get

< acx + < xcy -< acx ≅ < acx + < xby -< acx

cancelling out < acx and -< acx from both sides, we get

< xcy ≅ < xby (proved)