16. The circle Chas centre (5, 13) and touches the x-axis.
(a)
Find an equation of C in terms of x and y.
(b)
Find an equation of the tangent to Cat the point (10.1), giving your answer in the form
ay+bx+c = 0, where a, b and c are integers.

Could answer every question with steps

Imagine a new pasture with grass growing on it. every day after the seeds have germinated, the number of blades of grass in the pasture triples. after 18 days, the entire pasture is completely covered in grass. how many days did it take for the pasture to be one-third covered in grass?

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points