Answer:
It assigns the two values in the initialization list to the first two elements and default values to the other elements.
Step-by-step explanation:
Given
The array initialization
Required
Interpret the statement
double gallons[6] implies that the length/size of the array gallons is 6.
In other words, the array will hold 6 elements
{12.75, 14.87} implies that only the first two elements of the array are initialized ; the remain 4 elements will be set to default 0.