Approximately % of 7- year old children are taller than 51 inches

51 inches is 2 inches more than the mean, which is 1 standard deviation.

Using the 68, 95, 99.7 rule:

100-68 / 2 = 16% would be taller than 51 inches.

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

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft