For his long distance phone service, deandre pays a $7 monthly fee plus 7 cents per minute. last month, deandre's long distance bill was $15.47. for how many minutes was deandre billed?

Deandre was billed for 121 minutes.

Step-by-step explanation:

Let x represent the number of minutes for which Deandre was billed in a month.

For his long distance phone service, Deandre pays a $7 monthly fee plus 7 cents per minute. Converting 7 cents to dollars, it becomes

7/100 = $0.07

If he made x minutes of distance call in a month, his total cost would be

0.07x + 7

Last month, Deandre's long distance bill was $15.47. It means that

0.07x + 7 = 15.47

0.07x = 15.47 - 7

0.07x = 8.47

x = 8.47/0.07

x = 121

where are the choices?

- "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."