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89-15 = 74
15 + 74 = 89.
68
If you mean: 5*(2x-3)+89 then it works out as 10x+74
80%
15 - (-89) = 104
18 times 5 equals 90.
89 pounds minus 15% = 85% of 89 pounds = 89*85/100 pounds = 75.65 pounds
89
105/623 + 74/89 = 1
12p-15+8-4p = 89 12p-4p = 89+15-8 8p = 96 p = 12
Assuming all questions are worth the same amount of points, the answer is you can miss 23.14 problems, or rounded, 23 problems, which makes more sense.Here is the work, it's fairly elementary, so I won't explain each step:Let n be the number of problems you can miss.(89-n) / 89 = 74 / 100