Christopher has just returned to the united states from a trip to singapore and australia. he is looking over his records of the money he spent on his trip. the following list shows items and expenses christopher paid for before and during his trip, as well as whether the purchase took place in us dollars (us$), singapore dollars (s$), or australian dollars (au$). item cost currency camera 139.54 us$ ferry ticket 525.15 au$ passport 33.45 us$ guide book 62.99 s$ hat 42.74 s$ plane ticket 849.52 au$ when christopher was on his trip, the exchange rate for us dollars to singapore dollars was 1: 1.3914, and the exchange rate for singapore dollars to australian dollars was 1: 0.7786. how much did christopher spend in total, measured in us dollars? round all currency values to two decimal places.
a.
$1,517.89
b.
$1,526.19
c.
$1,809.35
d.
$2,776.72

Part one: measurements 1. measure your own height and arm span (from finger-tip to finger-tip) in inches. you will likely need some from a parent, guardian, or sibling to get accurate measurements. record your measurements on the "data record" document. use the "data record" to you complete part two of this project. name relationship to student x height in inches y arm span in inches archie dad 72 72 ginelle mom 65 66 sarah sister 64 65 meleah sister 66 3/4 67 rachel sister 53 1/2 53 emily auntie 66 1/2 66 hannah myself 66 1/2 69 part two: representation of data with plots 1. using graphing software of your choice, create a scatter plot of your data. predict the line of best fit, and sketch it on your graph. part three: the line of best fit include your scatter plot and the answers to the following questions in your word processing document 1. 1. which variable did you plot on the x-axis, and which variable did you plot on the y-axis? explain why you assigned the variables in that way. 2. write the equation of the line of best fit using the slope-intercept formula $y = mx + b$. show all your work, including the points used to determine the slope and how the equation was determined. 3. what does the slope of the line represent within the context of your graph? what does the y-intercept represent? 5. use the line of best fit to you to describe the data correlation.

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?