question 1:

which of the following expressions are equivalent to −3.5(2 − 3n) − 2.5n?

a. −7 − 8n
b. −7 + 8n
c. −7 − 13n
d. −7 − n(10.5 − 2.5)
e. −7 + n(10.5 − 2.5)

An episode of a television show is 60 minutes long when it originally airs with commercials. on a dvd without commercials, the episode is only 417 minutes long. how many1-minute commercials did the episode include when it originally aired? write and solve an equation to justify your answer.

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.