Y = 4(1.6)^x When y=12 solve for x 12 = 4(1.6)^x First,we need to flip it - we need to change them sides 4(1.6)^x = 12 Divide both sides by 4 4(1.6)^x/4 = 12/4 1.6^x = 3 Now we need to solve the exponent, which is x 1.6^x = 3 To solve for x, we need to take log of both sides log(1.6)^x = log(3) x*(log*1.6) = log (3) x = log(3)/log(1.6) x = 2.34
