PLEASE HELP Decide if each statement is true or false. Be prepared to explain your reasoning. (-38.76)(-15.6) is negative
10,000−99,999<0
34-43=0
(30)(-80)−50=50−(30)(-80)

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6