3) Sandra adds a toxic substance to a sample of 500 bacteria in a petri dish. The sample has a half-life of one minute. The situation can be modeled by an exponential decay function. State the function and sketch the
graph. (Hint: y = a. b* and use a table to help graph)

How do you find principle and simple interest

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?