Answer:
12. 7.5
13. 0.224
14. 193.5
15. 2/3
16. 5/7
17. -10
18. 2:1
19. 16
20. 150
21. 46,200
22. 4
23. 18
24. 5.29
25. 7.07
26. 19.80
27. 15.87
28. 9.80
29. 6.71
30. 1.26
Explanation:
12. 5/8 = x/12
8x = 60
x = 7.5
13. x/1.11 = 1/5
5x = 1.12
x = 0.224
14. 6x /27 = 43
6x = 1161
x = 193.5
15. x+2)/3 = 8/9
9x + 18 = 24
9x = 6
x = 2/3
16. (3x -5)/4 = -5/7
21x - 35 = -20
21x = 15
x = 5/7
17. (x-2)/4 = (x+4)/2
2x - 4 = 4x + 16
-2x = 20
x = -10
18. 9 grams of fat.
6 grams are saturated.
9-6 = 3 grams are cheese.
ratio of saturated to cheese = 6:3
= 2:1
19. goats to sheep = 4:7
7/11 x = 28
x = 28 × 11/7
x = 44
goats = 44-28 = 16
20. 280:4 = 10,500:x
280/4 = 10,500/x
280x = 42000
x = 150
21. 42:2 = x:2200
42/2 = x/2200
92,400 = 2x
x = 46,200
22. √(2×8) = √16 = 4
23. √(9×36) = √324 = 18
24. √(4×7) = √28 = 5.29
25. √(5×10) = √50 = 7.07
26. √(28×14) = √392 = 19.80
27. √(7×36) = √252 = 15.87
28. √(8×12) = √96 = 9.80
29. √(3×15) = √45 = 6.71
30. √4/5 × 2) = √8/5 = 1.26