The critical points of a rational inequality are x = –4 and x = 2. Which set of points can be tested to find a complete solution to the inequality? x = –4 and x = 2
x = –5 and x = 3
x = –5, x = 0, and x = 3
x = –4, x = 0, and x = 2

Anyone know? will mark brainliest if you're correct!

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

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)