7(x-1) / x(x+3) divided by (x+5) / (x+3) rational expressions

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

How does reflecting or rotating a figure change the interior angles of the figure?