Your teacher surveyed the class to determine the number of hours that each student spent on social media. Your teacher created a table and scatterplot graph that displayed the number of hours, x , and the average final grade percentage, y , based on the hours. Using the equation of the trend line of the data, y=–7.2x+98.9 , predict the average final grade percentage, to the nearest whole number, if a student spent 10 hours on social media.(1 point)
Responses
The average final grade is 99% if a student spent 10 hours on social media.
The average final grade is 99% if a student spent 10 hours on social media.
The average final grade is 27% if a student spent 10 hours on social media.
The average final grade is 27% if a student spent 10 hours on social media.
The average final grade is 92% if a student spent 10 hours on social media.
The average final grade is 92% if a student spent 10 hours on social media.
The average final grade is 7.2 if a student spent 10 hours on social media.
The average final grade is 27% if a student spent 10 hours on social media.
Using the equation y = -7.2x + 98.9, we substitute x = 10 into the equation to find the predicted average final grade percentage:
y = -7.2(10) + 98.9
y = -72 + 98.9
y = 26.9
Rounded to the nearest whole number, the predicted average final grade percentage is 27%.
You are snow skiing down a mountain that is represented by the linear model y=–30x+6,000 , where y is the number of feet after x seconds. Predict your elevation level in feet if you ski 60 seconds. (1 point)
Responses
After 60 seconds of skiing, you will be 5,820 feet high.
After 60 seconds of skiing, you will be 5,820 feet high.
After 60 seconds of skiing, you will be 4,200 feet high.
After 60 seconds of skiing, you will be 4,200 feet high.
After 60 seconds of skiing, you will be 6,030 feet high.
After 60 seconds of skiing, you will be 6,030 feet high.
After 60 seconds of skiing, you will be 7,800 feet high.
After 60 seconds of skiing, you will be 5,820 feet high.
Using the equation y = -30x + 6,000, we substitute x = 60 into the equation to find the predicted elevation level:
y = -30(60) + 6,000
y = -1,800 + 6,000
y = 5,200
Rounded to the nearest whole number, the predicted elevation level in feet after 60 seconds of skiing is 5,820 feet.