Find the surface area of the cylinder to the nearest whole number the figure is not drawn to scale

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

State if the two triangles are congruent. if they are, state how you know?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?