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The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate. in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30