If a sample of 21 runners were taken from a population of 580 runners, could refer to the mean of how many runners' times? a. 21 b. 580 c. neither 21 nor 580 d. both 21 and 580

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

Plz hurry evaluate the expression a+b where a=8 and b=19

Rose and andrew are financing $128,000 to purchase a condominium. they obtained a 15-year, fixed-rate loan with a rate of 5.05%. they have been given the option of purchasing up to four points to lower their rate to 4.81%. how much will the four points cost them?