Karen is trying to choose a cell phone plan. company j charges a subscruptio fee of $30 per month plus $1 per hour of use. company k charges no monthly fee but charges $2 for every hour of use.

30+h = 2h

h = 30 hours

For 30 hours, she can choose either

For < 30 hours, company k

For > 30 hours, company j

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