exam Maths Puzzle Numerical Ability

If you have a standard deviation of 86 pounds, a random sample of 90 and a mean breaking strength of 1850 pounds, find a 90% confidence interval for the true mean .
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exam Other Question
Solve for x:
8(^2x)+8^x-12=0 Convert the following to polar form, answer in degrees
(i)4 - j2.4
(ii)-5.1 + j1.7