Pls help I need help!

Find the length of side A.

Me find the missing dimension of a triangle height: 7 in., area: 21^2

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

On this question. a hypothermia occurs when a person's body temperature drops below 95 degrees fahrenheit. write and solve an inequality that describes how much lower the body temperature of a person with hypothermia will be than the body temperature of a person with a normal temperature of 98.6 degrees fahrenheit