The fuel economy of car, measured in miles per gallon, is modeled by the function f(s) = -0.009s^2 + 0.699 + 12 where s represents the speed of the car, measured in miles per hour. What the fuel economy of the car when it travel at an average of 20 miles per hour

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answer-

the equation that models this pattern is

solution-

a researcher placed a petri dish with 32,000 bacterial cells. one hour after being placed in the vacuum chamber, the number of cells in the petri dish had halved. another hour later, the number of cells had again halved.

this can be represented as exponential decreasing function,

where,

putting the values,

y-intercept means, where x=0, so

the coordinate of this poin will be (0, 32000)

this means when x=0 or at the starting of the research, the number of bacteria cells was 32000.

after 3 hours, number of bacteria cells will be,

the   coordinate of this point will be (3, 4000)