30 points thx 1) the first month after opening, a pizza restaurant had a loss of $320. for the next month the restaurant showed a profit of $126. which expression shows an expression that could be used to find the total loss for the two months in dollars? a. -$320 + $126 b. $320 - $126 c. -$320 + (-$126) d. $320 + $126 2) gina lost three bracelets. each bracelet was worth $17. which expression represents one way to calculate her total loss? a. $3 + $3 + $3 b. $17 + $17 c. 3 + $17 d. 3 x (-$17) 2) the temperature during the day in miami was 92f. during the night, the temperature fell 4f. what expression could be used to calculate the temperature in the morning? a. 92 + 4 b. 92 - (-4) c. 92 - 4 d. -92 + 4

I'm confused on this could anyone me and show me what i need to do to solve it.

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10