Question

calc help

Answer 1

We can determine which one is true by
using an example.
We want a function that is positive, decreasing, and concave up on [a,b].
y = 1/x satisfies these conditions on [1,2]

Answer 2

how is it positive and decreasing

Answer 3

1/x > 0 on [1,2]
https://www.desmos.com/calculator/h71in7kfem

Answer 4

what does the answer choice mean by left and right sum?