7.Find a quadratic polynomial whose zeros are 5 and -5

8.If p and q are the zeroes of x2+7x+12 then find the value of 1/p + 1/q -2pq

9.If one zero of the polynomial 5z2+13z-p is the reciprocal of the other, then find p

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean