To increase by a percentage, multiply by the 1+(the percentage/100). i.e. in this case to find 25% we'd multiply by 0.25, so to increase by 25% we basically find 125% of it, which involves multiplying by 1.25.
8*1.25 is 10, so the spider ate 10 bugs this month.
It's Answer A/The top answer. Vertical lines are x-values and horizontal lines are y-values, and since everything is shaded to the left of the purple line, it'd be x is less than or equal to 5