It's a kite or a rhombus.
To find the mean or the avg you add up all the numbers you have and then divide by how many numbers you added together in this case 5


so the mean is 22, hope this helped you!
I'm not 100% sur what it is asking but I think the expression would be
15 min. * 10 = min. till the tank is full
That answer is A and B pick one