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.

11

step-by-step explanation:

32.50-7.50=25

225/25=11

answer: the distance

step-by-step explanation:

to calculate the distance d of a line segment with endpoints (x1, y1) and (x2, y2) use the formula d (x2 x1)2 (y2 y1)2. to calculate the midpoint of a line segment with endpoints (x1, y1) and (x2, y2) use the formula

its a trick question

step-by-step explanation:

dogs love water, just turn on the hose and it will run in circles chasing the water all day : )