Whats the answer? Thanks

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

Written as a simplified polynomial in standard form, what is the result when (2x+8)^2(2x+8) 2 is subtracted from 8x^2-38x 2 −3?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18