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#33200

linear

functions

hard

90 sec

The depth of water $D (t)$ in feet at a certain pier $t$ hours after high tide is given by the function $D (t) = 18 - 2.5 t$ . A boat requires a minimum water depth of 10 feet to dock safely. What is the maximum number of hours after high tide, to the nearest tenth of an hour, that the boat can dock safely?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.