What's the missing number in the pattern 12,24,72,288

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Which of the following is true for the relation f(x)=2x^2+1