Every saturday morning, arnold quickly washes the family's breakfast dishes so that his father will allow him to wash his car. in this instance, washing the car is a(n)
a. negative reinforcer.
b. conditioned response.
c. positive reinforcer.
d. unconditioned response.

How many times do you read a text when you use the close reading model?i am desperate

The story line remains the same. the kids live in what was then one of the remaining beachfront slums, down the coast from the expensive malibu area. the beach was ruled by surfers, but in the afternoon, when the waves died down, some of the surfers, or their younger brothers, fooled around on skateboards. one day, skip engblom, the shop owner, comes up with a key breakthrough, polyurethane wheels: "they grip." with the additional traction, the z-boys try skating the sides of the big, open drainage canal that runs through the area. then comes a brainstorm: because of a drought, the area's swimming pools were drained. the kids started "borrowing" pools when the owners weren't home, to skate the curved sides.” where did “the lords of dogtown” originally practice their tricks? a. the beach c. an open drainage canal b. empty pools d. none of these

Used for an event that has been completed before the present moment in time. simple past past perfect perfect progressive past perfect progressive