exam Maths Puzzle Numerical Ability

This is from the Chapter 4 - test, and I have no notes or examples.

s=35 + 0.5s

just not sure what I do.
Thanks

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exam Other Question

From 1990 to 1993, the number of truck registrations (in millions) in the united states can be approximated by the model R=0.29t^2+45 where t is the number of years since 1990. During which year were approximately 46.16 million trucks registered. two ships leave a harbor traveling on courses that have an angle of 120 degrees between them. if they each travel 515 miles how far apart are they (to the nearest mile)?