Here are the prices of five new skateboards, in dollars: 75, 82, 100, 120, 140.
the standard deviation is about $27.
if a sixth skateboard is added to the sample that has a price of $450, what
happens to the standard deviation?

the forst and 3rd

step-by-step explanation:

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

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