Answer:
radius = 7
Explanation:
the equation of a circle in standard form is
(x - h)² + (y - k)² = r²
(h, k ) are the coordinates of the centre and r is the radius
given
(x - 5)² + (y + 3)² = 49
or
(x - 5)² + (y + 3)² = 7² ← is in standard form
with radius r = 7