Suppose that two people standing 6 miles apart both see the burst from a fireworks display. after a period of time, the first person standing at point a hears the burst. four seconds later, the second person standing at point b hears the burst. if the person at point b is due west of the person at point a and if the display is known to occur due north of the person at point a, where did the fireworks display occur? note that sound travels at 1100 feet per second.
the fireworks display north of the person at point a

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2