A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 95%95% confidence interval with a maximum error of 0.190.19 reproductions per hour. Assuming that the mean is 6.46.4 reproductions and the standard deviation is known to be 1.81.8, what is the minimum sample size required for the estimate? Round your answer up to the next integer.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.