I've been practically falling asleep in class for the past week and now I need to study my ass off to make up for it. Here are 3 questions that I'm having trouble with.

1) Given y = -4(x-6)^2+5

a) Find the maximum or minimum vaue of y. Which is it?

b) For what value of x does the max or min occur?

2) A rectangle has dimensions 3x and 5-2x

a) What is the maximum area of the rectangle?

b) What value of x gives the maximum area?

3) A rectangular lawn measures 7m by 5m (I'm in canada, we do meters!) A uniform border of flowers is to be planted along two adjacent sides of the lawn. If the flowers that have been purchased will cover an area of 6.25m^2, how wide is the border?

Thanks alot!