Cynthia ordered steamed dumplings from a chinese restaurant for lunch. The dumplings cost 6.25 plus tax. If the tax rate is 8.625% what expression can Cynthia use to find the total tax?

where is the option given

"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

answer: the answer for that is 22/3