How do you know whether an equation will be true for all values of x, one value of x, or no value of x?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6