An expression for the total cost of a taxi ride travelling x miles would be: 2.50 + .75x This is because the entry cost is $2.50, so that cost will always be there. Since each mile costs $.75, and we don't know how many miles will be traveled, we use x in place of a number. To solve for a cost, you can substitute the amount of miles traveled for x.
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a straight line only has 180° at all times so it is a matter of subtraction. 180-68 is 112° so from there you can find #2 as 68°, #3 as 90° and #4 as 90°, and so on.
