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7th Grade Math, x² − 2xy + c, 2x2+5xy, x + 3 > 2, 25 miles per hr, For…

- - - - Intergers are. a whole number (not a fractional number) that can be positive, negative, or zero
        
        -6 ÷ 2
        
        4 + 4 = 4 × 2 = 8.
        
        +6 - 2 = +4
        
        -9 - +4 =
- - - - porportion. a part, share, or number considered in comparative relation to a whole.
        
        1 : 3 (for every one boy there are 3 girls) 1 / 4 are boys and 3 / 4 are girls.
      - A unit rate means a rate for one of something
      - ratio the quantitative relation between two amounts showing the number of times one value contains or is contained within the other.
        
        if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six
      - constant of poportionality. is the ratio of two proportional values at a constant value
- - - - statistics the practice or science of collecting and analyzing numerical data in large quantities, especially for the purpose of inferring proportions in a whole from those in a representative sample.
        
        measures of central tendency is a central or typical value for a probability distribution
        
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        mode
        
        mean
        
        common methods to represent statistics are charts and diagrams and statistical maps
        
        bar graphs
        
        circle graphs
        
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      - probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true
- - - - mathematics, an algebraic expression is an expression built up from integer constants, variables, and the algebraic operations
    - - inequalities. a statement of an order relationship—greater than, greater than or equal to, less than, or less than or equal to—between two numbers or algebraic expressions.
    - - expressions
        In maths, an expression is a combination of numbers, variables, functions
- - - - a tip is a sum of money customarily given by a customer to certain service sector workers such as hospitality for the service they have performed, in addition to the basic price of the service
      - mark up add a certain amount to the cost of goods to cover overhead and profit.
      - a compulsory contribution to state revenue, levied by the government on workers' income and business profits, or added to the cost of some goods, services, and transactions.
      - mark down reduces the indicated price of an item.
- - - - |x| = x if x >= 0, -x if x < 0
- - - - geometry
        
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