If f(x)=1/3x+13 and g(x)=3x^2+6x+12, what is the value of f(g(x))?

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

Math i have no idea how to do a and b