Answer:
24
Step-by-step explanation:
If Matilda earns $48 in 4 hours, then she must earn 48/4 (12) dollars per hour. We know she earns $12 per hour, and that she made $288, so we divide the total amount earned (288) by her hourly wage ($12) to find she worked 288/12 or 24 hours.
(1+2i)(1-2i)
Plug in 4 for x
9(4) + 7 = 40
36 + 7 = 40
43 ≠ 40
No, 4 is not a solution
hope this helps
5