help me with this thank you! detailed solution ty typewritten much better

Find the sum , use the summation cap abilities of a graphing utility verify your result c . J w O N J = - 4 K = 1 use sigma notat on to write the sum Use the properties of summation capabilities of a graphing utility to verify your result. eUse the summation formulas to rewrite the expression . without the summation notation. use the result to find the sum for n = 10 106, 1000 , and 1000 0. 7 1 +4 j = 1 Use Left and right endpoint and the given number of rectangles to find two approximation of the area of the region between the graph of the function & the xaxis over the given Inferval. 26. f ( x) = 9 - x [ 2 , 4], 6 rectangles 28. g ( x ) = x 2+ 1 [ 1. 3] , 8 rectangles 30 . g ( x ) = sin x [ o, T ] , 6 rectangles