With these 2 questions asap after cruising at 750 feet below the surface of the ocean, a submarine rises 325 feet. how many more feet must they rise in order to reach the surface? second question a has one triangular base and three triangular lateral faces. choices: rectangular prism, triangular prism, triangular pyramid, square pyramid

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?