11- The volume of water in a tank is modeled by the function y = 1.15 x^3 - 0.1 x^2 +2 where x is the number of minutes after the faucet filling the tank is turned on. (a) What is the y-intercept of the graph ? (b) what does it represent in this context?

SORRY I'M IN STD.6TH CLASS SO I DON'T KNOW THE ANSWER!!

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45

- "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."