Assuming sea level is at 0, you would first subtract 25.65 from 0 to indicate diving 25.65 feet BELOW 0. Then, you subtract 16.5 from that. Then, add 12.45 to that number to get the answer after the diver rose 12.45 feet.
It is a vowel only when it teams up with an <a>, <e>, or <o> to spell a single sound—as in the words draw, few, and low. So the letter <w> is a vowel only in the two-letter teams <aw>, <ew>, and <ow>. Everywhere else <w> is a consonant
