Write two expressions that are equivalent to 3 . 10^-6

What is the length of the unknown leg in the right triangle ?

Simply 8x squared + 5(7x squared- x) - 2x =

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