Help ASAP!!

Put the polynomial in standard form

5x-3x^3+1+6x^2

A: -3x^3+6x^2+5x+1
B: 1+6x^2+5x-3x^3
C: 6x^2+5x-3x^3+1
D: -3x^3+5x+6x^2+1

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

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.

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb