The dataset CO2 contains the results of an experiment on the cold tolerance of a grass species, Echinochloa crus-galli. There are several variables in this dataset, but we are interested in two in particular: the Treatment which denotes if the plant was chilled or not and uptake which is a numeric variable denoting the uptake rate in umol/m2sec. Construct a 95% confidence interval for the difference in means between uptake rate between plants that were chilled and plants that were not chilled.

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

addition

step-by-step explanation:

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

no because after the troops were pulled many blacks were killed by hangings lynchings and other cruel ways which in a way interrupted the reconstruction of the south and differed from the way abraham lincoln had an idea of reconstruction