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Dear Student

u = -15 cm
R = 10 cm 
v = ?
m = ?
f = 10/2 = 5 cm

(a) 1/v + 1/u = 1/f
1/v = 1/f - 1/u
1/v = 1/5 - 1/(-15)
1/v = 1/5 + 1/15
1/v = (3 + 1) /15
1/v = 4/15

v = 15/4 cm = 3.75 cm

(b) m = -v/u = - 15 / 4(- 15)
m = 1/4 = 0.25

(c) The image formed by convex mirrors are virtual.

Regards