Answer:
the number is -39
Step-by-step explanation:
2(n-6)=3(n+9)
2n-12=3n+27
-2n -2n
-12=n+27
-27 -27
-39=n
She started with 200 stamps
10
6²+8²
=100
√100
=10
0.3939
r = 6 in
=
r²h/3 = 216
r² (18/3) = 6 r² = 216
r² = 216/6 = 36
r = 6