F(b)-F(a)/b-a
A=10 B= -2
F(a) =4 F(b)=17
17-4/-2-10
13/-12
18 minutes because 6*2 is 12 and 3*6 is 18. it will take 6 minutes to do 4 problems, 9 minutes to do 6 problems , 12 minutes to do 8 problems, 15 minutes to do 10 problems, and 18 minutes to do 12 problems
Answer:

Step-by-step explanation:
(times 6 on both sides)
(add 4 to both sides)
(divide R on both sides)
thus

Well it's giving you what the cost is (42.3), so plug that in for

:

And now you need to solve for the number of visits (

)!


So you can visit the museum a maximum of 2 times!
Together, Mary and John had $19.73