A student has started a lawn care business. He charges $15 per hour to mow lawns and $20 per hour for gardening. Because he is still in school, he is only allowed to work for at most 20 hours per week. His goal is to make at least $300 per week. .Create a system if equations or inequalities that models the situation. Define the variables you use.

He could mow laws for 20 hours equaling in exactly $300 dollars.  He could work He could work on garden beds for 15 hours to equal $300 dollars.  He could work on garden beds for 15 hours and then work on lawns for 5 hours equaling $375.  Those are just three ways that came to mind, hope it helped :D

15x20 = 300

20x15=300

20x15 + 15x5 = 375

f(x) has value 150 at x= 0

and 0 at x= 3

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

i think the answer is b