36599 round to the nearest thousand 100,699 round to the nearest thousand

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

Ihonestly have no clue if it's each or none.