If PQ=12, QR=20, PS=12, and SR=20, then QS=

QS=23.32

Step-by-step explanation:

by Pythagorean theoremh square is equal to p square + b square

so h=√12×12+20×20h=√144+400h=√544h=23.32

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The basic rule when it comes to multiplying or dividing integers are the same. If both numbers have the same signs, the answer will have a positive sign. If both number are opposite in signs, the answer will have a negative sign. Thus, the answers are:

The quotient of one negative fraction and one positive fraction is negative. 
The quotient of two positive fractions is positive.
The rules for the signs of quotients are the same as the rules for the signs of products.