a scientist has two solutions which she has labeled solution a and solution b. each contains salt. she knows that solution a is 40% salt and solution b is 90% salt. she wants to obtain 30 ounces of a mixture that is 45% salt. How many ounces of each solution would she use

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

since, she already spent $112.49

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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

its a i did it myself

step-by-step explanation: