I could use some help here! ill do whatever it is that gives you guys points :))

Nu is designing a rectangular sandbox. the bottom is 16 square feet. which dimensions require the least amount of material for the sides of the sandbox.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.