5(x+3) - 4x = 6(2x + 3) - 12

-aftrer distributing and combining like terms, this problem should

a) -9x +3 = 12x - 9
b) -9x - 15 = 12x + 6
c) -6x = 15x - 12
d) -9x - 15 = 8x - 3

Based on what i know about mean, this doesn't add up.

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?