What is the common difference for this arithmetic sequence
45,40,35,30,25,...

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.

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?