The half–life of rubidium–89 is 15 minutes. if the initial mass of the isotope is 250 grams, how many grams will be left after 100 minutes? a. 2.46 grams b. 0.0098 grams c. 0.90 grams d. 225.31 grams

these sign is used to tell weather the number is greater or less than the number   <   or >     but this sign means its equal =    

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step-by-step explanation:

"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