What is a7, the 7th term of a geometric sequence if a8=10 and a9=5

Using d, e, and f as values on a triangle and d being 60 degrees, what is the value of e and f if d is 60 degrees? also, what do you notice about the values of e and f?

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Based on the graph, what is the initial value of the linear relationship? a coordinate plane is shown. a line passes through the y-axis at -2 and the x-axis at 3.