Using the method from the previous problem, the solution of , for with

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Select the correct answer.
?

A.
B.
C.
D.
E.

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Answer: D

Mathematics

Solve the problem.SPA Corporation has about 23,500 employees who serve as security guards. The average length of service for these employees is 9.3 years with a standard deviation of 4.2 years. Compute the length of service for each employee. Round to the nearest one-tenth of a year.A time in service with a z-score of 1.3.A time in service with a z-score of -0.5

A. 13.5, 5.1 B. 7.4, 9.4 C. 14.8, 7.2 D. 17.3, 9.2

Simplify using the power rule of exponents and the rule for raising a product to a power.(-5xy7)2

A. -25x14y14 B. 25xy9 C. 25x2y14 D. -25x2y14

Complete the identity.cos (? + ?) cos (? - ?) = ?

A. 2 - sin2? - sin2? B. cos2? - 2 sin2? sin2? C. cos (?2) cos (?2) + sin (?2) sin (?2) D. cos2? - sin2?

Which metric unit (km, m, cm, or mm) should you use to measure the following item?Length of an auto race 

A. m B. cm C. km D. mm