Colleen is touring an automobile plant. The tour guide tells her that they use 938 kg of aluminum to make 7 cars. All of the cars are the same so they use the same amount of aluminum for each car. If they have only used 100 kg of aluminum on the car they are building right now, how much more aluminum do they need to finish the car?

34 kg

Step-by-step explanation:

(938/7) = 134 kg per car, so since they only have 100 kg, 34 kg are missing to complete the car.

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%