I need help w chem questions, im posting this here so people can know and go over there since chemistry section isnt checked regularly. I need help so so badly please try to help me, this is my midterm test and i need a good grade

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

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)