F(x)=5-2x and g(x)=5x+2x . prove that f-1(x)+g-1(x)=0 for all values x

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Select the number of ways in which a line and a circle can intersect

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?