5th grade math. correct answer will be marked brainliest

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

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).