A submarine drops at a rate of 19 feet per minute. What is the submarine's depth, in feet, after 4 minutes? a 67
b -67
c 76
d -76

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Twelve less than a number is at most 20

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.