9514 1404 393
Answer:
x = 5
Step-by-step explanation:
The angle bisector divides the sides proportionally.
(2x -1)/9 = 3x/15
5(2x -1) = 3(3x) . . . . . . multiply by 45
10x -5 = 9x . . . . . . . . . eliminate parentheses
x = 5 . . . . . . . . . . . . . . add 5-9x
So in matt's equation, he made a mistake in the a transision from line 2 to line 3
in line 2: -4(-2)2
in line 3: -4(4)
the mistake is that -2 times 2 is not equal +4 it is equal to -4
also from lines 5 to 6 he made a mistake in order of opperations (mulit division then addition and subtract)
line 5: -10+30/5
line 6: 20/5
so he first subtracted 10 then divided, he should have divided then subtracted
so the equation should have equaled
Karen used the correct (-) times (+) property and the order of operations
so Karen is correct and Matt is wrong.
5/8 = 5 ÷ 8 = .625
move decimal 2 places to right for %
.625 = 62.5%