Help please. Find the value of each variable.

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.

Polygon hh is a scaled copy of polygon gg using a scale factor of 1/4. polygon h's area is what fraction of polygon g's area?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c