Last year, the price of a certain computer was $150 more than it is now. this year's price is 3/4 of last year's price. how much does the computer cost this year?

The computer's price for this year = $450

Step-by-step explanation:

Let,

The computer's price for this year = X

The computer's price for last year = X + 150

According to the question,

X - X*(3/4) = 150*(3/4)

or, X - 3X/4 = 450/4

or, (4X - 3X)/4 = 450/4

or, X/4 = 450/4

or X = 450

Therefore, The computer's price for this year, X = $450

So, it will be less than $150 from last year.

- "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."