If it took mark 45 minutes to get to work and 35 minutes to get home. how long did she spend traveling to and from work?

80 Minutes

Step-by-step explanation:

45 minutes to work plus 35 minutes to get home is a total of 80 minutes

Wouldn’t you just add them?

If so it would be 80.

Or it could be 70.

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50