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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?

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).