A rock is tossed into a lake and creates a ripple with a radius that increases at a rate of 20 cm/sec. The radius of the ripple can be expressed as the function R(t) = 20t, where t represents time in seconds. The area of the circle made by ripple can be expressed as the
function () = qır?, where r represents the radius in centimeters.

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

Which expression gives the exact value of x?