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If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g