Solve the exponential equation and approximate the result, correct to three decimal places.3x = 23
A. 7.667
B. 0.350
C. 2.037
D. 2.854
Answer: D
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Solve the equation. Express radicals in simplest form.x2 = 49
A. 24.5 B. ±8 C. 7 D. ±7
Solve the problem.A sample of 400 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 10 years? Round your answer to the nearest whole gram.
A. 12 g B. 1 g C. 282 g D. 0 g
Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, give the solution with y arbitrary.9x - 7y = -14-7x + 4y = 8
A. ? B. {(-1, 3)} C. {(0, 2)} D. {(0, 3)}
Provide an appropriate response.The mean of grouped data is:
A. the sum of the frequencies of the intervals. B. a reasonable approximation. C. exactly equal to the midpoint of the interval. D. the sum of the products of the intervals.