What is the sum of this arithmetic series?

ASAP WILL MARK BRAINLIEST

Can someone check my answer? you

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

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.