Question

Write the Riemann sum to find the area under the graph of the function f(x) = x^2 from x = 1 to x = 5.

answer choices posted in picture

Answer 1

I think the first one or the thrid one 
hope this help

Answer 2

$\lim_{n \to \infty}$∑ -- agggg

The 2nd one, but get me a minute to write up the explaination/equation I can't do it with the symbol brainly provides