Show that if a ≡ b (mod n) and c is a positive integer, then ca ≡ cb (mod cn)

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

What is the solution set of the quadratic inequality x2- 5< 0? o {xl-55x55{x- 155x55){xl -55x5 15){x1 - 15 sx5/5)

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.