-1/7,0,1/7 is the answer!!!
0/9 = 0 and 3/0 = undefined. Any number divided by 0 is undefined, while 0 divided by any number is just 0.
If 30% of his collection is 12 cars, then we can use the fraction
30/12=100/x
x=40
Answer:
1. c. 628 cubic cm
2. c. 502 cubic inches
Step-by-step explanation:

1.) 3.14 x 5^2 x 8
3.14 x 25 x 8 = 628
2.) 3.14 x ( 8/2 )^2 x 10
3.14 x 4^2 x 10
3.14 x 16 x 10 = 502.4
we have the following:

solving for b:

therefore, the answer is 16