HELP HELP HELP What invention did Muslim scholars advance using their knowledge of astronomy?

algebra
cartography
the water clock
the camera obscura

Match the people with the appropriate description. vernon and irene castle arthur murray fred astaire willi ninja a. stylized the forms of ballroom dance by incorporating other dance forms b. responsible for renewing the influence of ballroom dance in america c. godfather of vogue danced. responsible for standardization/teaching of steps leading to spread of ballroom dance education