Determine how many lines of symmetry each object has. Then determine weather each object has rotational symmetry

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

This is so hard and it’s for a test

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin