Please help! What is the degree of the polynomial – 6ry2 +5r4 – 7z?

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

What is the volume of the sphere shown below with a radius of 3?

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.