Aparabola has its vertex at (2, 2), and the equation of its directrix is y = 2.5. the equation that represents the parabola is

In vertex form the equation is

In standard form the equation is

Step-by-step explanation:

The equation of the directrix tells us that this is an x-squared parabola.  Because the directrix is above the vertex, the parabola will open downward.  The vertex form of this equation is:

where p is the number of units between the directrix and the vertex.  The number of units here is .5 or 1/2.  Filling in the coordinates of the vertex and the p value of 1/2:

Simplifying we have:

Divide both sides by 2 to get:

Add 2 to both sides to get the final vertex form:

If you want that in standard form, you first need to expand the squared term to get:

Order of operations tells us that we have to distribute in the -1/2 first to get:

which simplifies to the standard form:

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.

a

step-by-step explanation: