Zapisz dziewięć kolejnych liczb naturalnych trzycyfrowych. wskaż liczbę podzielą przez 9. nie wykonując dzielenia, znajdź reszty z dzielenia tych liczb przez 9 oraz przez 3

Start with the smallest 3-digits number 100. Then 9 consecutive natural 3-digits numbers are:

100, 101, 102, 103, 104, 105, 106, 107, 108.

Rule: A number is divisible by 9 if the sum of its digits is divisible by 9.

The remainders after division by 9 are:

8, 7, 6, 5, 4, 3, 2, 1, 0 (number 108 have the sum of digits 1+0+8=9 that is divisible by 9 without remainder. Each previous number gives the remainder that is 1 more than the next one).

Rule: A number is divisible by 3 if the sum of its digits is divisible by 3.

The remainders after division by 3 are:

2, 1, 0, 2, 1, 0, 2, 1, 0 (numbers 102, 105, 108 have the sums of digits 3, 6, 9 that are divisible by 3).

step-by-step explanation:

we are given a graph for system of inequalities.

in order to write the system of inequalities for the given graph, we need to find the inequality for each of the line separately.

let us find the slope of dotted line first.

taking two coordinates on the graph.

let us say (0,0) and (3,1).

let us find the slope of the line now.

slope of the dotted line would be =.

y-intercept of dotted line is y=0 only.

plugging slope m= and b=0 in slope-intercept form y=mx+b, we get

.

the line is shaded up of that dotted line.

therefore, for shading up we would take greater than inequality symbol > .

and because it's a dotted line we would take only > symbol in place of = sign in above equation of line.

therefore, inequality for dotted line would be

let us take two points (3,1) and (0,4) on the solid line.

slope of the solid line would be =.

for the solid line we have y-intercept b= 4.

plugging slope m= -1 and b=4 in slope-intercept form y=mx+b, we get

y = -1x + 4.

the line is shaded down of that solid line.

therefore, for shading down we would take less than inequality symbol < .

and because it's a solid line we would take ≤ symbol in place of = sign in above equation of line.

therefore, inequality for solid line would be