Solve the system of equations by substitution.

3x + 4y = 31

2x - 4y= -6

a. (4, 5)
b. (5, 4)
c. (-5, 12.5)
d. (5, -4)

Parks is wearing several rubber bracelets one third of the bracelets are tie dye 1/6 are blue and 1/3 of the remainder are camouflage if park swears to camouflage bracelets how many bracelets does he have on

Is a positive integer raised to a negative power always positive

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score