Joseph took skydiving lessons. the skydiving shack charges $45 per hour for lessons. joseph also gave his skydiving instructor a tip of $20. (a) define the unknown in the scenario and assign it a letter or symbol. the unknown is how long he took the lessons for. the letter i choose is x (b) write an expression to represent the amount of money that joseph paid for his skydiving adventure. (score for question 3: of 5 points)

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.