Answer:
The second camera. The second camera is $30 cheaper than the first camera.
Step-by-step explanation:
The equation of the first store is y = 20x + 50. Keep this in mind.
Replace x with 12 in each of these equations to determine which is cheaper.
y = 20(12) + 50 = $290
y = 15(12) + 80 = $260
So the second store is cheaper.
$29 dollars is the overall change in his account. The reason that this is correct is because if you make a number line -4 is exactly 29 units away from 25.
Answer:
6
Step-by-step explanation:

This is a basic subtraction problem :-).
You will subtract how much money the mechanic gives to the supplier; which in this case will be $20, by the total amount of the parts which is $14.56.
20-14.56 = 5.44
Therefore, he will receive $5.44 in change for the transaction.