Jamie tried to solve an equation step by step.

2/5n+7=12

2/5n=5 (step 1)

n=2 (step 2)

find jamie's mistake

a: step 1

b: step 2

c: jamie did not make a mistake

this is for 10 points and i will be giving out yous and

Step 2

Step-by-step explanation:

Jaime did not multiply by the reciprocal of 2/5 which is 5/2 on both sides.

5*5/2=25/2

Step-by-step explanation:

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:

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.