Question

Please help by checking my answer! These are the last two questions on my test. Thank you.

11. A cylinder has a radius of 2x + 3 and a height of 6x + 1. Which polynomial in standard form best describes the total volume of the cylinder? Use the formula V= pi r2h for the volume of a cylinder.

12 pi x2 + 20 pi x + 3 pi

24 pi x3 + 76 pi x2 + 66 pi x + 9pi

144 pi x4 + 480 pi x3 + 472 pi x2 + 120 pi x + 9pi

72 pi x3 + 132 pi x2 + 38 pi x + 3pi***



19. A group of art students are painting a mural on a wall. The rectangular wall has dimensions of (6x + 7) by (8x + 5) and they are planning the mural to be (x + 4) by (2x + 5). What is the area of the remaining wall after the mural has been painted?


46x^2 + 73x + 15***

48x^2 + 86x + 35

2x^2 + 13x + 20

50x^2 + 99x + 55

Answer 1

#11. Nope. You did pi rh^2 instead of p r^2h
#19 ok

Answer 2

no, yes