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Archaeology
The branch of anthropology that studies prehistoric people and their cultures.
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Chapter 3 – Water and the Fitness of the Environment
3.1 – The polarity of water molecules results in hydrogen bonding
• Polar molecule – two ends of the molecule have opposite charges
• Oxygen: δ-
• Hydrogen: δ+
• Positive hydrogen of one molecule is attracted to negative oxygen of another in a hydrogen bond
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Derivitives
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Factoring Polynomials of Degree 3
Factoring a 3 - b 3
An expression of the form a 3 - b 3 is called a difference of cubes. The factored form of a 3 - b 3 is (a - b)(a 2 + ab + b 2) :
(a - b)(a 2 + ab + b 2) = a 3 - a 2 b + a 2 b - ab 2 + ab 2 - b 3 = a 3 - b 3
For example, the factored form of 27x 3 - 8 ( a = 3x, b = 2 ) is (3x - 2)(9x 2 + 6x + 4) .
Similarly, the factored form of 125x 3 -27y 3 ( a = 5x, b = 3y ) is (5x - 3y)(25x 2 +15xy + 9y 2) .
Handout Module 2 Review ? Words for Operations
Subtraction
Minus
Difference between
From
Less
Less than
Fewer than
Decreased by
Take away
?a number minus 2?
?the difference between a number?
?2 from a number?
?a number less 3?
?2 less than a number?
?2 fewer than a number?
?a number decreased by 2?
?a number take away 2?
x ? 2
x ? 8
n ? 2
n ? 3
y ? 3
y ? 2
x ? 2
x ? 2
Final Review Sheet
Radio Active Decays
Alpha decay occurs when the nucleus emits an alpha particle. Alpha particles have a positive charge and are equivalent in size to a helium nucleus, and so they are symbolized as . Alpha particles are the largest radioactive particle emitted. This type of radioactivity results in a decrease in the atomic number by 2 and a decrease in the atomic mass by 4. The equation below shows uranium-234 undergoing alpha decay:
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