You threw a rock off the balcony overlooking your backyard. The table shows the height of the rock at different times. Use quadratic regression to find a quadratic model for this data.
Time
(in seconds)
0
1
2
3
4
5
Height
(in feet)
31
482
55.8
53.8
422
21
O a. -5.3x2 +21x-27
O b.-4.8x? - 22x + 31
OC.-4.8x2 + 22x + 31
O d.-4.3x2 +23x - 35

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.