Without using a calculator, choose the statement that best describes the value of \sqrt{215} 215

Multiply. −2x(6 x 4 −7 x 2 +x−5) express the answer in standard form. enter your answer in the box.

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)