When alex, the marketing manager of hartwell inc., realized that his plan to increase sales levels was not producing the results he desired, he took quick action to make necessary adjustments. according to this scenario, alex was exercising the management function of

Controlling function.

Explanation:

Controlling function is taken by Alex the marketing manager to determine the cause of poor recorded sales and determine ways of increasing sales. Controlling function in management occurs, when a manager of an organization monitors the outcome of his organization to check if the organization's goals are being met. If the goals are being achieved the manager finds ways to maintain it and if the goals are not being met takes corrective measures.

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30