book Maths Puzzle Numerical Ability

use the discriminant to determine how many real number solutions the quadratic equation -4j2 + 3j - 28 = 0 has. please and thank you!!!

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book Other Question

How do I find the volume of a cone that has a circumfrence at the base of 100 feet and its height is 14 feet high. Write the first four terms of the sequence an=64(1/4)^n, for n=0, 1, 2, 3,
How do I finish problem?