Three girls are selling cases of popcorn to earn money for a band trip. in their first week, emily sold 2 3/4 cases, brenda sold 4 1/4 cases, and shannon sold 31/2 cases. how many cases of popcorn have the girls dold in all?

Well convert all of them into fourths. 3 1/2 = 3 2/4. Add all the whole numbers 2 + 4 + 3 = 9 and then add the fractions 1/4 + 3/4 + 2/4 = 6/4 = 1 2/4.  Finally add the whole number and fraction together, 10 2/4 or 10 1/2.

10 1/2 cases of popcorn.

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629

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