The exact trigonometric ratio of sec 3pi/7 is what?

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed