Nwhich quadrants of the coordinate plane is the shaded region of the system located?

y ≥ x
y ≥ -x

For each expression use a property to write an equivalent expression.

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?