Hard Sat Questions Math Hot! ◆ | REAL |

"The population of bacteria doubles every 3 hours." A student writes P = 100(2)^t . Wrong. If it doubles every 3 hours , the exponent must be t/3 . The correct formula is P = 100(2)^(t/3) .

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If the question has variables in the answer choices (e.g., "Which expression is equivalent to..."), invent a simple number for the variable (like x = 2 or x = 3 ), solve the question numerically, and then plug x=2 into all the answer choices. The one that matches your numerical answer is correct. "The population of bacteria doubles every 3 hours

x^2 - 6x + (7 - c) = 0