27^{3x}=(1/9)^x
write in b^x=b^y form

3^9x=3^-2x

Step-by-step explanation:

27^3x=(1/9)^x

3^3×3x=(1/3^2)^x

3^9x=3^-2x

answer: given the scale 3,5 mm to 1 foot: so you know this and you need convert this 150mm to get the right answer.