book Maths Puzzle Numerical Ability

Can you please show me how do graph, calculate the focal radius, and plot the two foci for the equation {{{4x^2+9y^2-16x+90y+205=0}}}

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Please help me with this problem:
Two cyclists start biking from a trail’s start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first
Increase revenue. Even though the number of tickets sold for a concert decreases with increasing price, the revenue generated does not necessarily decrease. Use the formula R= p(48