Element X decays radioactively with a half life of 10 minutes. If there are 290 grams of element X, how long, to the nearest tenth of a minute, would it take the element to decay to 16 grams?

41.8

Step-by-step explanation:

sorry, can't i suggest going to algebra.com

step-by-step explanation:

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