The scale of a park map says that 2 cm represents 6 km. what is: a. the distance ( cm ) on the map that represents an actual distance of 9 km? b. the actual number of km that is represented by 5 cm on the map?

Having a hard time understanding this question (see attachment).

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?