There are 5 red marbles, 8 blue marbles, and 12 green marbles in a bag.

what is the theoretical probability of randomly drawing either a red marble or a blue marble?

20%
32%
52%
13%

95.03 is the answer. hope this !

"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