Which function represents a reflection of f(x) = 5(0.8)x across the x-axis?

What is the solution to the equation 9^(x+1) =27

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?

In a column proof the right column states your reasons