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9E-05x
4e-1 = 7 Multiply both sides by e: 4 = 7e Divide both sides by 7: 4/7 = e
4 e - 9 = 19 + 9 = + 9 Inverse of -9 --------------------- 4 e +0 = 38 -9+9 cancels ----- ------- 4 4 Divide 4 to both sides ---------------------- e = 9.5 OR 9 R2
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The notation "4e 21" on a calculator represents the number ( 4 \times 10^{21} ). The "e" stands for exponent, indicating that the number 4 should be multiplied by 10 raised to the power of 21. This is a shorthand way of expressing very large numbers in scientific notation. Thus, it equals 4 followed by 21 zeros.