exam Maths Puzzle Numerical Ability

Straw weight is 7.8 grams.. It should be 7.0 grams. what is the % RPM off density. If RPM is 150?

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Hello,
I need help solving this problem.

Rewrite the middle term as the sum of two terms and then factor completely.

15x^2 - 21x + 6 This question is really troubling me and i could use some help please. Given that �e� is a complex number, solve e + 6ē = 7 (note: ē is the complex conjugate of e)