Write the equation of a parabola with vertex (2,-1) and directrix y=-3

Step-by-step explanation:

a parabola is the graph of a quadratic equation, so the general equation is

If the directrix is negative, it means the graph opens down, so a is -

and c is -3

this gives us

all we need now is what is b

b is the y intercept for

to find the y intercept, we plug in 0 for x

so the y intercept is -3

so the equation is

spinning a 1, 2, or 3. option d.

step-by-step explanation: when spinning a number graph up to 4, and aiming for any number less than 3, that automatically eliminates the number 4. now you have two numbers to spin on that are less than 3, but the number 3 is included in this question because it's no greater of an number than itself. i hope this you : )