Chnician A says that horn frequency can range from 1,800 to 3,550 Hz. Technician B says that most horn circuits use a relay and the current through the relay coil is controlled by the horn switch. Which technician is correct?

Both

Step-by-step explanation:

- The horn frequency ranges from (1,800 to 3,550) Hz.

- When the horn button is pushed the circuit is closed allowing the current to flow through the circuit that magnetizes the solenoid system.

- The magnetic field created by the solenoid attracts the relay ( iron ) and pulls it down changes the diaphragm of the horn and thus produces sound.

Part (a)

Let's replace x with 15 and evaluate to see if he is correct or not.

x/2 - 3 = 6

15/2 - 3 = 6

7.5 - 3 = 6  

4.5 = 6

We get a false statement after simplifying everything. We need to get the same number on both sides to get a true statement. Therefore, Ahmed is not correct.

Part (b)

Let's solve for x. We do so by first adding 3 to both sides, and then multiplying both sides by 2. This follows PEMDAS in reverse, undoing everything to isolate the variable.

x/2 - 3 = 6

x/2 = 6+3 add 3 to both sides

x/2 = 9

x = 9*2 multiply both sides by 2

x = 18 is the answer

As a check, we'll use the same idea as part (a)

x/2 - 3 = 6

18/2 - 3 = 6

9 - 3 = 6

6 = 6

We get a true statement this time. This confirms x = 18