I need help plz! A circular plate has circumference of 19.5 inches. What is the area of this​ plate? Use 3.14 for pi. The area of this plate is about (blank) square inches.
​(Round the final answer to the nearest whole number as needed. Round all intermediate values to the nearest thousandth as​ needed.)

Consider the function f left parenthesis x right parenthesis equals 4 x squared minus 3 x minus 1f(x)=4x2−3x−1 and complete parts (a) through (c). (a) find f left parenthesis a plus h right parenthesis f(a+h); (b) find startfraction f left parenthesis a plus h right parenthesis minus f left parenthesis a right parenthesis over h endfraction f(a+h)−f(a) h; (c) find the instantaneous rate of change of f when aequals=77.