Answer:
x = -1
Step-by-step explanation:
Let the mystery number be x
Equation:
60 - 4x = 8x + 72
Subtract 60 from both sides
-4x = 8x + 12
Subtract 8x from both sides
-12x = 12
x = -1
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-Chetan K
For an investment compounded continuously, the rule of 69 gives a better approximation than the rule of 72 (for normal compound interests).
For letter b you do length times width times height
