PQRS is a rectangle. The slope of side PQ is −23. What is the slope of the side adjacent (next to) PQ?

Hint: In a rectangle, all four angles are right angles..

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How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)