Mars take 686 days to orbit the sun. what percent of this time does the earth take to orbit the sun

1. whats 2/3 plus 1/9 2. 5/7 plus 1/2 3.7/15 plus 2/15

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?