Which expression represents the product of an unknown number and 19?
a.
19 ÷ n
b.
n + 19
c.
n – 19
d.
19 • n

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?