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H varies directly as L. If H = 21 when L = 30, determine H when L = 20. a) Write the variation equation. b) Determine the value of the quantity indicated. a) Choose the correct answer below. k A. = O L H OB. H=L OC. H=kL k D. = O H L b) H = E (Type an integer or a decimal.) Assume that the stopping distance of a van varies directly with the square of the speed. A van traveling 20 miles per hour can stop in 40 feet. If the van is traveling 32 miles per hour, what is its stopping distance? If the van is traveling 32 miles per hour, the stopping distance is D feet. (Type an integer or a decimal.) If y varies directly as x, and y = 7 when x = 6, nd y when x =18. v=|:| If y varies inversely as x, and y = '12 when x = 8, nd y when x =10. y = I] (Simplify your answer.)