Hey!!!
Answer is....
diagonals of square bisect each other at right angles.
let diagonal be 2x
Using Pythagoras in a triangle enclosed by a side and 2 half diagonals...




side of a diagonal=2 sqrt50

cm......
HOPE IT HELPS YOU '_'
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a = ( 0 , 7 ) & b = ( 3 , 1 )
First need to find the slope using the following equation :




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We have following equation to find the point-slope form of the linear functions using the slope and one of the through points .




I choose point (( a )) to put in the equation.



Add sides 7


This the slope-intercept form .
Done...
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(0.75 * 3.5a) + (0.75 * -6b) = 2.63a -4.5b
I believe its C. because you have to solve for x.
The answer is 24.62. Hope this help