I would prolly distribute the number on the outside of the parenthesis into the first pair of parenthesis but keep the parenthesis there, so for #17 it would turn out to be (2x-2)(x+2),
and then use foil (first outer inner last). so then #17 is 2x^2 + 4x - 2x - 4
and then you'd combine like terms to get the answer: <u>2x^2 + 2x -4</u>
As a decimal 4/15 = 0.2666667 As a decimal 3/10 = 0.3 [talk about close] 3/10 is bigger.
You could take an average to find something between 4/15 and 3/10 1/2(4/15 + 2/10) 1/2(8/30 + 6/30) 1/2(14/30) 1/2(7/15) 7/30 is between the two given numbers..