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:

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify