A particle moves along the x-axis so that at time t > 0 its position is given by X(t) = -5t4 + 30t^2. Determine all intervals when the speed of the particle is
increasing

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Step-by-step explanation:

please don't be mad I really need some points

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