The unknown digit is 7 because 6.471 is greater than 6.470 and less than 6.48.
Answer:
Step-by-step explanation:
0.2x + 2.7x - 8.1 = 6.9 + 1.1x
0.2x + 2.7x - 1.1x = 6.9 + 8.1
1.8x = 15
x = 15/1.8
x = 8.33
Answer:
17. 20
18. 50
19. 50
20. 70
21. 110
22. 160
Step-by-step explanation:
I did this assignment already :)
Answer: 3x^2 +120x
Good luck !