Ara buys two items that cost d dollars each. She gives the cashier $20. Which expression represents the change she should receiv
1 answer:
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Answer:
Slope is defined as the difference in the vertical axis divided by the difference in the horizontal axis, going left to right (s = dy/dx). P has a lesser x co-ordinate, so it will be R - P in this case, giving us (ry - py) / (rx - px):