Let a and b be nonempty bounded subsets of r(real numbers), and let a+b be the set of all sums a+b where a∈a and b∈b.

a)prove sup(a+b)= supa + supb (hint: to show supa+supb
b)prove inf(a+b)= infa+infb

What is the area of a pizza with a radius of 40 cm leave the answer in terms of π to find your exact answer 40π cm² 1600π cm² 800π cm² 80π cm² π=pi

Triangle xyz has vertices x(1,3), y(0,0)

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.