Write Explicit or Recursive Functions Practice Test

A ball is thrown upward from a platform 4 feet high with an initial upward velocity of 24 ft/s. Its height (in feet) after $t$ seconds is modeled by a quadratic function with gravity $-16t^2$. What is the formula for the height function $h(t)$?

A phone plan costs $\$25$ each month plus $\$0.05$ per text message sent. What function models the monthly cost $C(t)$ (in dollars) in terms of the number of texts $t$?