Spongebob noticed that his favorite pants were not as clean as they used to be . his friend sandy told him that he should try using clean-o detergent, a new brand of laundry soap she found at sail-mart. spongebob made sure to wash one pair of pants in plain and another pair in water with the clean-o detergent. after washing both pairs of pants a total of three times, the pair washed in the clean-o detergent did not appear to be any cleaner than the pants washed in plain water.

6.what was the problem spongebob wanted to investigate?
7.what is the independent variable?
8.what is the dependent variable?
9.what should spongebob's conclusion be?

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."