Find the area of a circle whose diameter is 20 cm. (Use pi = 3.14)

Here is my question! 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.true or false?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

Josie buys a pair of boots that retail for $52.00 dollars, however they are currently on sale for 25% off how much does josie pay for the boots if there is also a 6% sales tax on them