Which of the summation properties or formulas require the lower index to be 1? Check all that apply.

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

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.

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top