Simplify and multiply. write answer as a simplified fraction. ( - 4/7 ) ( - 7/16 )

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Find the domain and range of the following function f(x) = 51x - 21+ 4