Graph by making a table. y= -8x

What is the product of the radical expression. (7-2square root) (8+2 square root)

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

Find the value of the variable and the length of each secant segment.