Please help its a quiz. Plus do like A B C D

Layla answer 21 of the 25 questions on his history test correctly.what decimal represents the fraction of problem he answer incorrectly.

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?

Alice is paying her bill at a restaurant. but tax on the cost of a male is 5%. she decides to leave a tip 20% of the cost of the meal plus the tax