Add the fractions and simplify the answer 21/4+55/6+32/3

Which statement explains what upwelling causes? a. upwelling causes tides to rise and fall. b. upwelling causes changes in the direction of currents. c. upwelling causes nutrients, minerals, and tiny organisms to rise. d. upwelling causes currents in the pacific ocean to change direction. i think the answer is c.

Look at the photo i can’t do geography

How would you find the measure of one interior angle