<span>-12+2b=12-6b
-12+8b=12
8b=24
b=3</span>
Answer:2592/25
Step-by-step explanation: Big circle is pi*r^2= (4+3+3)^2*pi =314.15 minus 4^2*pi=50.26 equals 263.89. the big circle minus the first 2 layers of the circle = the outer circle. 314.15-(4+3)^2*pi=160.21 263.89-160.21=2592/25
Area of a circle is πr^2.
From this, we can calculate
π*2.5^2
= π*6.25
= 19.625
= 19.6
Answer:12 secondes
Step-by-step explanation:48 seconds/ 4 people= 12 second