Answer:
m= 7.5
b= 30
Step-by-step explanation:
if the diameter of a circle is 15, its radius is half that or 7.5.
46.8
23.7%
The percentage change can be computed as ...
((new value)/(original value) -1) × 100%
= (58/76 -1) × 100%
≈ (0.763 -1) × 100% = -23.7%
The decrease is 23.7%.