1. If r varies directly as s and inversely as the square t, and r 4
when s 20 and t-5, find
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1. If r varies directly as s and inversely as the square t, and r 4
when s 20 and t-5, find
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Answer:
r = ks/t²
4 = k(20)/(-5)²
4 = 20k/25
4 = 4k/5
5/4 × 4 = 4k/5 × 5/4
20/4 = 20k/20
5 = k