What is the justification for the step taken from line 2 to line 3? 3x+9-7X=X+10+X
-4x+9=2x+10
-6x+9= 10
-6x=1
1
X=-
6
W
O the subtraction property of equality
O the multiplication property of equality
O combining like terms on one side of the equation
O the distributive property

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)

The plant were you work has a cylindrical oil tank that is 2.5 feet across on the inside and 10 feet high. the depth of the oil in the tank is 2 feet. about how many gallons of oil are in the tank?