Ughh i need help with prop of operationd

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?