Answer:

Step-by-step explanation:
Take out 4:
4(x^2-8x)-12
=4(x^2-8x+16-16)-12
=4(x^2-8x+16)-64-12
=4(x^2-4)^2 - 76
=
19. No
20. No
21. Yes
23. 1.8 miles
Answer: 15 dimes and 13 nickels
Step-by-step explanation:
-3 2/5 - 5/6 = -127/30
-2/3 + 6 1/8 = 107/24