exam Maths Puzzle Numerical Ability

Write the equation 7 x(x - 15) = - 252 in quadratic form and then solve it by factoring

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Hello I was wondering if you could help me on this problem?

Simplify. (i is for imaginary number.)

(3-6i)/(-4i)

Thank you,
Kumi a rental car agency charges $14 per day plus 9 cents per mile to rent a certain car. another agency charges $19 per day plus 6 cents per mile to rent the same car. how mony miles w