Pls help Will give points! And brainlest

What expression is equivalent to 42x-56y

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

80 points suppose marcy made 45 posts online. if 23 of them contained an image, what percent of her posts had images? round your answer to the nearest whole percent. 54 percent 51 percent 49 percent 48 percent