Which one would this be?

D. 12 minutes

Step-by-step explanation:

1 key chain = 1m 35s

                  = 60s + 35s

                  = 96s

8 key chains = 96s × 8

                     = 768s

                     = 12m 48s

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)