Answer:
for the first picture: less than zero (the slope is negative because it's going down)
for the second picture: slope is greater than 1 (the slope is positive because it's going up)
for the third picture: slope is greater than 1 (the slope is positive because it's going up)
for the fourth picture: slope is 0 (it's a horizontal line)
Yu add the products of the two numbers by 7
1-8/9=1/9 of students do not have cell phone,
we can express this fraction as %
1/9*100%=11.11%≈ 11%
