Use cross products to solve the proportion.

StartFraction 4 over 3 EndFraction = StartFraction x over 12 EndFraction

1. Use cross products: (4)(12) = 3x

2. Multiply: 48 = 3x

3. Divide both sides by 3:
= x

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Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

Which two undefined geometric terms always describe figures with no beginning or end?