1. The problem statement, all variables and given/known data i am have to approximate the area under the curve using left endpoints. 2. Relevant equations y= squr(x+2) on [1,4], n =16 3. The attempt at a solution i have the change in x to be 3/16 using (b-a)/n i also found my xsubi to be (1+3i/16) using xsubi = xsubo + i(chang in x). then i got (3/16) E (squr(1+(3i/16)+ 2)) i am stuck on how to get the i out to then apply the formula n(n+1)/2 or n(n+1)(2n+1)/6. Thank you ahead of time. another question similar problem but i get stuck after i dont know how to take the i out of cos(pi(i)/100) i tried multiplying by sec but i still dont get the right answer. do i multiply by sec? to get the i out of cos(pi(i)/100)?