[99 pts] answer these questions . 1.if a = -9 and b = -4, what is the value of a + b ? -5 5 -13 13 2. simplify 2 x2 - y for x = 3 and y = -2. 20 14 16 10 3. the cost for children under twelve at a certain buffet restaurant is a base charge of a dollar plus twenty-five cents for each year of the child's age. represent this cost as an expression, using y to stand for the child's age in years. then use the expression to find the cost for a child who is nine. 1 + 0.25 y ; $2.25 1 + 0.25 y ; $3.25 0.25 + y ; $9.25 0.25 + y ; $8.75 4. tommy and his family drove home from his grandparent's house in three and a half hours. if they drove at an average rate of 48 miles per hour, which of the following formulas could be used to find how far away tommy lives from his grandparents? d = rt t = d/r r = d/t 5. tommy and his family drove home from his grandparent's house in three and a half hours. if they drove at an average rate of 48 miles per hour, about how far away does tommy live from his grandparents? 144 miles 192 miles 168 miles 180 miles 5. hillary opened a savings account with $1,500. how much simple interest will she earn if she leaves the money in the account for two years at an interest rate of 0.025? use the formula i = prt . $750.00 $37.50 $375.00 $75.00 6.convert 15°c to fahrenheit. use the formula f = c + 32. 59°f 27°f 85°f 33°f answer them !

Overproduction of uric acid in the body can be an indication of cell breakdown. this may be an advance indication of illness such as gout, leukemia, or lymphoma.† over a period of months, an adult male patient has taken nine blood tests for uric acid. the mean concentration was x = 5.35 mg/dl. the distribution of uric acid in healthy adult males can be assumed to be normal, with σ = 1.87 mg/dl. (a) find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. what is the margin of error? (round your answers to two decimal places.) lower limit upper limit margin of error (b) what conditions are necessary for your calculations? (select all that apply.) σ is unknown n is large σ is known normal distribution of uric acid uniform distribution of uric acid (c) interpret your results in the context of this problem. there is not enough information to make an interpretation. the probability that this interval contains the true average uric acid level for this patient is 0.05. the probability that this interval contains the true average uric acid level for this patient is 0.95. there is a 95% chance that the confidence interval is one of the intervals containing the population average uric acid level for this patient. there is a 5% chance that the confidence interval is one of the intervals containing the population average uric acid level for this patient. (d) find the sample size necessary for a 95% confidence level with maximal margin of error e = 1.10 for the mean concentration of uric acid in this patient's blood. (round your answer up to the nearest whole number.) blood tests