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The GCF is 8c.
25.12circumference = pi x diamaterlet pi = 3.14c=3.14 x 8c=25.12
(8a)(8b) = (8c)/(8d); multiply both sides by 8d to obtain (8a)(8b)(8d) = (8c); divide both sides by 8 to obtain (8a)(8b)d = c; divide both sides by (8a)(8b) to obtain d = c/[(8c)(8b)].
-8c + 1 = -3 => -8c = -3 + 1 => -8c = -2 => c = -2/(-8) => c = 1/4 = 0.25
If 8c = 60, then c = 60/8 = 7.5.