PLEASE HELP ME WITH THIS PROBLEM!! Evaluate each expression if x = 2, y = 5, and z = 5?
8. 3z + 4
9. 5x + 2z
10. x² + 5y = 2

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar