Why does the author discuss different playground equipment in
the section "From Strides to
Slides"?

To tell how playgrounds changed over time

Explanation:

The story talks about how playgrounds become safer for children.

To tell how playgrounds changed over time

Explanation:

the answer is:  

he is voicing feelings shared by all humans regardless of race.

in paul laurence dunbar's poem "we wear the mask," he replicates the words mask and we to emphasize how people in general -not just black americans- hide their true feelings. he suggests the masks cover people's faces and eyes, which are the main parts that display their emotions. he also thinks people's pain conceal behind those masks, so that they cannot see reality and nobody is able to see one another's sorrow.

never read it so if i had i would definitely you sorry.