The number of bacteria present in a culture after t minutes is given as B - 1000 ex where k is a constant. If there are 8520
bacteria present after 15 minutes, find k and round to the nearest thousandth

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

Tim knows the volume and base area of a wooden chest that is in the shape of a rectangular prism. if the volume is 524 cubic unit and the base area is 15 square unit, what is the height of the chest? 124 unit 1124 units 112 unit 1112 units

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?