exam Maths Puzzle Numerical Ability

A 30 degree,-60degree,-90degree triangle has a hypotenuse of length 12 inches. What are the lengths of the legs?

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Social Science. The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula fo My Problem is to find the slope and y intercept for x= -7. Should my answer be;
1.)Slope:0; y-intercept;none or 2)Slope: undefined; y-intercept:none? I want to say that the answer