What is the solution to the equation 2/5x=7/10?

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 is he correct? explain why or why not?