Please help i need help with math

Write two subtraction equations that are equivalent to 5 + 12 = 17.

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

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?