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Express all terms with a common base, which is 2.

Chemistry

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Question 1: Solve for xx: 4x+1×22x−3=5124^{x+1} \times 2^{2x-3} = 512

Step 1: Express all terms with a common base, which is 2.

4=224 = 2^2 512=29512 = 2^9

Step 2: Substitute these into the equation.

(22)x+1×22x−3=29(2^2)^{x+1} \times 2^{2x-3} = 2^9

Step 3: Apply the power rule (am)n=amn(a^m)^n = a^{mn}.

22(x+1)×22x−3=292^{2(x+1)} \times 2^{2x-3} = 2^9 22x+2×22x−3=292^{2x+2} \times 2^{2x-3} = 2^9

Step 4: Apply the product rule am×an=am+na^m \times a^n = a^{m+n}.

2(2x+2)+(2x−3)=292^{(2x+2) + (2x-3)} = 2^9 24x−1=292^{4x-1} = 2^9

Step 5: Equate the exponents since the bases are the same.

4x−1=94x-1 = 9

Step 6: Solve for xx.

4x=9+14x = 9+1 4x=104x = 10 x=104x = \frac{10}{4} x=2.5x = 2.5

The value of xx is 2.5\boxed{2.5}.

Question 2: Use logarithms table to evaluate: 7.735×0.00460.693\frac{7.735 \times 0.0046}{0.693}

Step 1: Let N=7.735×0.00460.693N = \frac{7.735 \times 0.0046}{0.693}. Take the logarithm of both sides.

log⁡N=log⁡(7.735)+log⁡(0.0046)−log⁡(0.693)\log N = \log(7.735) + \log(0.0046) - \log(0.693)

Step 2: Find the logarithms of each number using logarithm tables.

log⁡(7.735)=0.8885\log(7.735) = 0.8885 log⁡(0.0046)=3ˉ.6628\log(0.0046) = \bar{3}.6628 log⁡(0.693)=1ˉ.8407\log(0.693) = \bar{1}.8407

Step 3: Perform the addition and subtraction of the logarithms.

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