Start taking notes - you'll at least want the statement types from p.77, and note down the properties from 2-5 and 2-6 as you read it. Anything in here can be used on the tests,

**and we'll have our first test next week!**

Read 2-6 and note down those properties!

Compost Math: Last time, Algebra 1 students used the formula (100 x 15% + H x 40%) / (100 x 1.5% + H x 1%) = 30/1 which can also be written (15 + 0.4H) / (1.5 + 0.01H) = 30 to find how many grams of hay (H) per 100 grams of kitchen scraps would be needed to get the carbon/nitrogen ratio in the compost to 30:1 (30 grams of carbon/1 gram of nitrogen).

They found that 300 grams would be needed for 100 grams of scraps, which is a lot! We might need newspaper instead...

What I want you to do is to create a

**formal (two-column) proof**to show that H=300. Start with one of the formulas above, and use the properties from 2-6.

Then move on to these problems: #4, 6, 10, 14-24 even, 30, 32, 38-44 (40 & 42 explain in terms of conditionals and laws), 50, 52.

Extra credit: 26, 28, 34, and 35.

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