12. A 1 Liter Solution of salt and water contains 10% salt. Water will be added to dilute the solution. a) Write an equation to represent the % of salt in a solution after x liters of water are added.
b) What is the % of salt in the solution after 4 liters of water are added?

correct answers below:

i think the answer is b.

step-by-step explanation:

not 100% sure though.

- "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."

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.