The table shows three values of $x$ and their corresponding values of…

Source Texts

Text

x

y

|
|---|---|
|1|13|
|2|21|
|3|

a

The table shows three values of

x

and their corresponding values of

y

for the equation

y = 4 (2)^{x} + 5

. In the table,

a

is a constant. What is the value of

a