A length is measured as 21 cm correct to 2 significant figures. what is the lower bound for the length?

hope this .

r3t40

people grow faster than other people.

step-by-step explanation:

should you really be posting this isn't math boi.

-2 is the right

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18