Two years ago Randi earned $18,400. Last year she earned $19,700. Suppose she earns $21,600 this year. 6. What total amount will Randi have earned for three years?
8. How much would Randi have to earn next year so that her four year average is $21,000?

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step-by-step explanation:

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step-by-step explanation:

total income = price of one ticket   *   number of tickets sold

  y                 =     4                                   x

so the equation is y=4x     with x≥0   because number of tickets sold can not be negative

thus the equation is a semi -line with an end point at

(0,0)

passing through :

x=1     y=4(1) = 4   so through (1,4)

answer: 3 x 2 = 6 and 6+0

step-by-step explanation: sum equals addition and twice is multiplication so its

3 x 2 = 6

6+0= 6

identity property of zero