Write an equation of a line that is perpendicular to the line x-2y=8

For what values of x is x2 + 2x = 24 true?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.