A school district is planning on buying new desks for its classrooms. Each secondary classroom is to have 10 more desks than an elementary classroom. For 15 elementary classrooms and 35 secondary classrooms, a total of 1200 desks are needed. The system of equations below represents this situation, where x represents the number of desks in an elementary classroom and y represents the number of desks in a secondary classroom. Which equation can be used to determine the number of desks in a elementary classroom, when solving by substitution?

The null and alternate hypotheses are: h0: μ1 ≤ μ2 h1: μ1 > μ2 a random sample of 22 items from the first population showed a mean of 113 and a standard deviation of 12. a sample of 16 items for the second population showed a mean of 99 and a standard deviation of 6. use the 0.01 significant level. find the degrees of freedom for unequal variance test. (round down your answer to the nearest whole number.) state the decision rule for 0.010 significance level. (round your answer to 3 decimal places.) compute the value of the test statistic. (round your answer to 3 decimal places.) what is your decision regarding the null hypothesis? use the 0.01 significance level.