Determine if each of the following statements is true or false. If a statement is true, then write a formal proof of that statement, and if it is false, then provide a counterexample that shows it is false. a. For all integers a, b, and c with a ≠ 0, if a | b, then a | (bc).
b. For all integers a and b with a ≠ 0, if 6 | (ab), then 6 | a or 6 | b.
c. For all integers a, b, and c with a ≠ 0, if a divides (b - 1) and a divides (c - 1), then a divides (bc - 1).
d. For each integer n, if 7 divides (n^2 - 4), then 7 divides (n - 2).

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

a. -0.3 > -0.33

it's both, now can you answer my most recent question?

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: