What is the value of y in the exponential decay function when x equals 2? y=2(0.8)x

Find an equation of the line perpendicular to the graph.

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Evaluate the expression for the given value of the variable 7a - 4a for a =8