Hello!
The angle is a right angle, which measures 90°.
3x + x = 4x
Angle = 4x + 10 = 90
Switch that around
90 - 10 = 4x
90 - 10 = 80
80 = 4x
Divide by 4

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To solve, use the distance formula:

. Using your values of x and y, you get

, which is approximately 9.22. This means your shortest distance is √85≈9.22
Answer:
ab and cd intersect at E because they are vertically opposite angles they always intersect at a point
5(-3x-7) (first multiply 5 to -3x then to -7)
-15x-35.
The answer is D) -15x-35