Help pls, will mark brainliest

If the coefficient of determination for a data set containing 10 points is 1,how many of the data points must lie on the regression line for the data set? a. 8b.10c.9d.7

(08.06 mc) devon and his friends bought strawberry wafers for $3 per packet and chocolate wafers for $1 per packet at a carnival. they spent a total of $30 to buy a total of 22 packets of wafers of the two varieties. part a: write a system of equations that can be solved to find the number of packets of strawberry wafers and the number of packets of chocolate wafers that devon and his friends bought at the carnival. define the variables used in the equations. part b: how many packets of chocolate wafers and strawberry wafers did they buy? explain how you got the answer and why you selected a particular method to get the answer

Sally is measuring the length her friends jump, susan jumps 1 2/3 yards. jody jumps half the length of susans jump how many inches did jody jump?