ANSWER : -8x + 56
i got it correct on my test
Volume of a Sphere = 4/3 πr³
v = 4/3 * 3.14 * (1)³
v = 4.186 Yd³
For 1 Yd³, it costs = $10
so, for 4.186 Yd³, it would be: 10 * 4.186 = 41.87
In short, Your Answer would be $41.87
Hope this helps!
There are 91 in total. Since there are 21 red cars, it would give you 21/91. Around a 23.07% chance.