Simplify 2x – 4 + 8x – 3. A. 6x – 1 B. 6x – 7 C. 10x – 1 D. 10x – 7

D. 10x-7

Step-by-step explanation:

Starting off, you have to combine like terms. So take 2x and 8x and add leave, giving you 10x. Then take -4 and -3 and add them, giving you -7.

10x - 7

Step-by-step explanation:

combine like terms

- "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."

answer: options

step-by-step explanation: