What is four and one half x two and five sixths

Si la base de un triángulo isósceles mide 70 m y el ángulo opuesto a ésta mide 58°; entonces ¿cuánto mide la altura de dicho triángulo? a) 21.87 m. b) 40.01 m. c) 43.74 m. d) 63.14 m.

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Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?