Find the standard form of the equation of the parabola with a focus at (3, 0) and a directrix at x = -3. serious answers only

That's a sideways one; let's go back to first principals.

A parabola is the locus of points equidistant from a point called the focus and a line called the directrix.

It's almost always better to work with squared distance:

The squared distance from (x,y) to (3,0) is

The squared distance from (x,y) to x=-3 is

Equating,

10 cm

step-by-step explanation:

if the polygon is a rectangle, then the perimeter is x+x+y+y. using the values that you gave, the perimeter is 3+3+2+2=10cm.

17

step-by-step explanation:

51/3=17

thus 17 is your answer.