Answer:
9x^4=6,561x
6x^2=36x
6561x+36x=6597x
Step-by-step explanation:
9x to the 4th power is just 9x9=81x9 and so on and the same goes for 6 then you just add them. Not Sure if this is the way you needed but feel free to ask anything.
3,400,000,000
3,000,000,000+400,000,000
Remember that when you find 30% of the number you have to subtract the 30% from your original $90 because it is 30% off the original price.