What does it mean for two integers to be opposites?

How a 3-buten-1-ol forms 3-pentenenitrile? The lengths of the legs of a right triangle are 15 centimeters and 20 centimeters What is the length of the hypotenuse? What day of the week was March 10 1958? Why are researchers so careful about drawing conclusions regarding statistical significance? What are singularities? How much is 3 out of 10? What does ka in a case number mean? What is the elapsed time 1159 am to 101 pm? What is the slope of a line passing thru points 64 and -2-4? If product of two whole number 5 what is the sum of those two numbers? What is the prime factorization of 252 in exponents? What is 1 over 12 to the 4th power without a fraction bar? What is the degrees and the hypotenues to a right triangle in trigonometry when the opposite is 14 and the adjacent is 20? What is the average speed of 54 km n 6 hours? Is an iron triangle efficient? What is an example of a line plot unit? What does the word abstruse? What are three two digits numbers that round to the nearest ten? How do you prove that the straight line y equals x plus c is a tangent to the curve x squared plus y squared equals 4 when c squared equals 8? What is your grade if you got a 34 out of 40 on a test?