Please answer i will mark brainliest!! answer first question and then second question

Find the quotient. 50a2 – 98b2 -5a +7b

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )