What is the area of a square with a perimeter of 12 feet?

The slope of a line is –2 and its y-intercept is (0, 3). what is the equation of the line that is parallel to the first line and passes through (2, 2)? a. 2x + y = 6 b. y = –2x + 3 c.y=1/2x +6 d.y=-2x-6

Can someone answer these problems for me

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side