book Maths Puzzle Numerical Ability

Write an equation for each conic section. Then sketch the graph.

circle with center (-6,9) and radius 9

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book Other Question

Each girl in the Lynberg family has the same number of brothers as she has sisters. Each boy in the family has twice as many sisters as he has brothers. How many girls & boys are t Could someone please explain how to do this problem and solve please?
(2x to the 4th power yz to the third power)squared
Also if anyone knows how to write out the fourt power I would really like to know.. Thank you