Find an equation equivalent to x^2 -y^2 =4 in polar coordinates

Find x & pleeeeaaaassseeee me !

1: 4 if the wew 35 surfboards at the beach how many were short boards?

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?