What is "The cube of twice a number"?

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

If you apply the changes below to the linear parent function f(x)=x what is the equation of the new function vertically stretched by a factor of 3 flip over the x axis