1. The library set up a special bookshelf for
math-interest books. There are 2 math-
history books, 3 books on statistics, 2 books
on number theory and 2 books on
geometry. If a student selects one book at
random, what is the probability of choosing
a math-history book?

step-by-step explanation:

step-by-step explanation:

hunhgunyt7 in u uuuhiuteu

- "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."