Algebra I reference formulas

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Algebra I reference SparkNotes.

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NUMBER SYSTEMSThe natural numbers are the numbers we count with:1, 2. 3, 4, 5, 6,, 27, 28, ..The whole numbers are the numbers we count with and zero:0, 1, 2, 3, 4, 5, 6, .The integers are the numbers we count with, their negatives.and zero: ... , -3, -2, -1, 0, I, 2, 3, .-The positive integers are the natural numbers.-The negotfve integers are the "minus" natural numbers:-1, -2. -3, -4, .The rcmonal numbers are all numbers expressible as ~fractions. The fractions may be proper (less than one; Ex: k) orimproper (more than one; Ex: ft). Rational numbers can bepositive (Ex: 5.125 =rational: Ex: 4 =y.-) or negative (Ex:- ~). All integers areThe real numbers can be represented as points on the numberline. All rational numbers aTe real, but the real number line hasmany points that are "between" rational numbers and aTe calledilTotional. Ex:0,To,v'3 -Real numbers.,-!1.2523 etc.-1, -2, -3, ..9, 0.12112111211112.IrrationalsThe imaginary numbers are square roots of negative numbers.They don't appear on the real number line and are written interms of i = FI. Ex: J=49 is imaginary and equal to iV49 or 7i.v'5~)'t2+3The complex numb
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