# Mathematics

isosceles triangle – a triangle with at least two sides with two equal lengths and two angles with equal measures
inverse property of multiplication – 5X 1/5=1
how do you change a decimal to a percent? – move the decimal point to the RIGHT two places then add a percentage sign after the number.
Discuss using permutation and combination to calculate the number of outcomes – When trying to calculate the probability of an event using the desired outcomes/ total outcomes formula, you may frequently find that there are too many outcomes to individually count them. Permutation and combination formulas offer a shortcut to counting outcomes. A permutation is an arrangement of a specific number of a set of objects in a specific order.
Permutation nPr=n!/(n-r)!
Combination nCr=nPr/r!
if log 2 = 0.301 and log 3= 0.477, what is log 5? – 0.69897
In the diagram, O is the center of the circle. XYZ is a straight line. YS = ZS and – …
Substitution Method – A method of solving a system of equations by replacing one variable with an equivalent expression containing the other variable.
Orthocenter – Lies on the inside of a triangle only if the triangle is acute
Orthocenter – Lies on the inside of a triangle only if the triangle is acute
Positive skewness – Values descending
n factorial – Written n! for n, an integer greater than 0
What are Peano Arithmetic Axioms? – 1. Zero is a number.

2. If a is a number, the successor of a is a number.

3. Zero is not the successor of a number.

4. Two numbers of which the successors are equal are themselves equal.

5. (induction axiom.) If a set S of numbers contains zero and also the successor of every number in S, then every number is in S.

0.75-1 – correlation coefficient of a strong positive correlation is
factor tree – a diagram showing how a composite number breaks down into its prime factors.
Permutations are Used… – Used when categories potentially overlap or when we are repeatedly picking objects form the same category
Permutations are Used… – Used when categories potentially overlap or when we are repeatedly picking objects form the same category
scalene triangle – is a polygon with three unequal sides
Describe the result of adding a large positive number and a smaller negative number – result is smaller positive number, same as ignoring the signs and subtracting smaller number
figure – n. 图形,形状,数字v. 描绘,演算,
Define variable, dependent variable, constant, and coefficient. – A variable is an unknown number or quantity represented by a letter.
A dependent variable is a variable with a value that is calculated based on the value of other quantities.
A constant is a number with a value that does not change.
A coefficient is a constant that is placed in front of a variable in an algebraic expression.

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