How do i convert 13°12' into decimal degrees?

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1