The formula for the area, a, of a trapezoid is shown below, where ݄h represents its height and b1 and b2
represent the lengths of its bases. for this problem, let b1 represent the length of its shorter base.
a=1/2h(b1+b2)
which of the descriptions below is equivalent to the formula shown above?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year the population of her town is changing by a constant rate

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

What is the y intercept of f(x)=(1/2)^x?