need it quick 13 points

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

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?