Suppose that a positive integer is written in decimal notation as n = akak−1 · · · a2a1a0 where 0 ≤ ai ≤ 9 (i. e. the ai are the digits of n). (a) prove that n is divisible 9 iff the sum of the digits ak + · · · + a0 is divisible by 9. for example, 123453 is divisible by 9 (try it! ) because 1 + 2 + 3 + 4 + 5 + 3 = 18, which is divisible by 9.

1 and 2

step-by-step explanation:

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

brainliest

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°

the correct option is b

step-by-step explanation: