ANSWER

Step-by-step explanation
We want to find the voltage of the battery.
To do this, we apply the relationship between voltage and current using Ohm's law:

where R = resistance
I = current
The resistance is the total resistance of the circuit. Since the resistors are in parallel, the total resistance is found by using:

Therefore, we have that:

Therefore, the voltage of the battery is:

The voltage of the battery is 14V.