Zalen surveyed his classmates about the number of pets they had in their homes. He displayed the results in this dot plot. How many people did Zalen survey? Please help me

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Which expression gives the area of the triangle shown below

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?