exam Maths Puzzle Numerical Ability

Find the polar form of the rectangular equation x^2 = 8y

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exam Other Question

Rocky McFrost spends 90 a week on karate and ballet lessons. If the karate lessons go up $10 a week, it will be two thirds the amount spent on ballet lessons. How much are the ballet lessons? How do I solve using a system of equations in two variables?

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers i 21. Find the numbers.