Deanna estimated the product of 6.45 and 10.2 below. (6.45) (10.2) ~ 6 x 10 = 60 how does the estimate compare to the exact product? a: the estimate is high because both factors are rounded down. b: the estimate is low because both factors are rounded down. c: the estimate is high because both factors are rounded up. d: the estimate is low because both factors are rounded up.