the inlet pipe of an oil tank can fill the tank in 1 hour 30 minutes. the outlet pipe can empty the tank in 1 hour. How long will it take to empty a full tank if both pipes open

30 minutes

Step-by-step explanation:

it takes 1 30 to fill and 1 to empty. subtract left with 30

3 hours

Step-by-step explanation:

If the input is 1 and 30 and output is 1, then we are left with 30 do that again and its 1 hour then if we do it again its 1 and 30 which is how long it initially takes to fill up the thing

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,