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Translate the given phrase into an algebraic expression and simplify if possible: the product of -13 and the difference
of cand d.

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

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.