## motorcrossteamD21 Group Title A family is having a pool built in their backyard. If their yard is rectangular and measures 7x by 6x and the pool is circular with a radius of 2x how much of the yard will be left over after the pool is built? 38x^2 42x^2 – 4pi x^2 42x2 – 2pi x^2 38pi x^2 one year ago one year ago

1. universitysucks

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2. motorcrossteamD21

A sports team is building a new stadium on a rectangular lot of land. If the lot measures 6x by 10x and the sports field will be 1x by 4x, how much of the lot will be left over to build bleachers on? 56x^2 64x^2 30x^2 60x^2

3. universitysucks

|dw:1349333653273:dw|Dude, these are really similar. Try to learn from my example and do some yourself, or you'll fail your test.

4. motorcrossteamD21

Simplify the product using the distributive property. 7. (5h – 3)(3h + 7) 15h2 – 44h + 21 15h2 – 26h – 21 15h2 + 44h + 21 15h2 + 26h – 21

5. motorcrossteamD21

Is it...15h^2 + 44h +21?

6. universitysucks

|dw:1349333996326:dw|Careful with negatives.

7. motorcrossteamD21

Oh, I guess that's where I went wrong. Thanks. These next ones, I am having trouble with the table part to get my answer. Simplify the product using a table. ( it wont show the table. but could you help me) Give me a minute to draw it out) 8. (5h + 4)(3h + 6) 15h2 + 42h + 24 15h2 – 42h + 24 15h2 + 18h – 24 15h2 – 18h – 24

8. motorcrossteamD21

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9. universitysucks

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10. motorcrossteamD21

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11. universitysucks

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12. motorcrossteamD21

I just don't understand putting the numbers in, and making the answer out of it. Simplify the product using FOIL. 10. (4x – 4)(3x – 4) 12x2 – 28x + 16 12x2 – 4x – 16 12x2 + 4x – 16 12x2 + 28x + 16 11. A cylinder has a radius of 4x + 2 and a height of 5x + 4. Which polynomial in standard form best describes the total volume of the cylinder? Use the formula V = pir2h for the volume of a cylinder. 80pix3 + 144pix2 + 84pix + 16pi 80pix3 – 144pix2 + 84pix + 16pi 80pix3 + 144pix2 + 84pix – 16pi 80pix3 + 144pix2 – 84pix + 16pi 12. A sphere has a radius of 4x + 4. Which polynomial in standard form best describes the total surface area of the sphere? Use the formula S = 4pir2 for the surface area of a sphere. 64pix2 + 128pix + 64pi 64pix2 – 128pix + 64pi 64pix2 + 128pix – 64pi 64pix2 – 128pix – 64pi

13. universitysucks

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14. motorcrossteamD21

12x2 – 28x + 16

15. universitysucks

Hooray!

16. motorcrossteamD21

Okay. I didn't know what FOIL was. Can you help me with the other 2 please.

17. universitysucks

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18. motorcrossteamD21

80(pi)x^3 + 144(pi)x^2 – 84(pi)x + 16(pi)?