Aball is thrown vertically upward from the top of a 100-foot tower, with an initial velocity of 20 ft/sec. its position function is s(t) = –16t2 + 20t + 100. what is its velocity in ft/sec when t = 1 second? (this is calculus, involving limits, and explain, because i mostly just need to know how to do this. : ) )

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt