Is my work and answer correct? the question was 3 1/3 plus 2 1/7

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

What is the value of p in the equation y^ = -4x?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)