Although all of the following systems can be solved via the substitution method, the substitution would be the best method for solving which system?

y = 3x + 1

y = 3x - 5

y = 2x + 3

2x + y = 5

0.5t - w = 2.5

2t + 3w = 4

3x + 2y = 18

4x + 5y = 60

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

135 is your answer

step-by-step explanation:

try 180 times three then divide that number by 4 (sides) to get your answer. im glad to : )

i only know the sequence of arithmetic it adds the first is 5+4 then it goes up as it adds to then it is 9+5 then 14+6 then to 20+7 and so on. 5,9,14,20,27,35.

step-by-step explanation:

nope.   happens to me as well.

-aparri