Weather balloons are filled with hydrogen and released at various sites to measure and transmit data about conditions such as air pressure and temperature. A weather ballon is filled with hydrogen at the rate of .5 cubic feet. Initially, the balloon has 4 cubic feet of hydrogen. A) Find a linear function V that models the volume of hydrogen at anytime t V(t)= B) If the balloon has a capacity of 17 cubic feet, how long does it take to complete fill the balloon?

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