Now that the metal has been isolated, scientists determined that this unknown metal could be either Lead (Pb) or Aluminum (AI). Below is a list of properties that could be used to identify the unknown metal extracted from the water. Choose the best intrinsic property that would determine if the metal is Lead (Pb) or Aluminum (AI).

linda: 3 ; laura: 15

step-by-step explanation:

note that linda + laura's age is 18, and that linda is 12 years younger than her sister.

let "linda" = x , "laura" = y:

x + y = 18

x = y - 12

first, plug in y - 12 for x in the first equation:

(y - 12) + y = 18

simplify.

2y - 12 = 18

isolate the variable (y). note the equal sign, what you do to one side, you do to the other. do the opposite of pemdas. first add, then divide.

2y - 12 (+12) = 18 (+12)

2y = 18 + 12

2y = 30

(2y)/2 = (30)/2

y = 30/2

y = 15

next, plug in 15 for y in the second equation (the other equation would work too).

x = y - 12

x = (15) - 12

x = 3

linda's age is 3, laura's age is 15.

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where are the choice options?

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)