99 points + brainliest answer to first person.
which is the focus of a parabola with equation y^2 = 4x?
a). (–1, 0)
b). (0, –1)
c). (0, 1)
d). (1, 0)

  D).  (1, 0)

Step-by-step explanation:

The parabola opens to the right, so the focus will be to the right of the vertex at (0, 0). The only answer choice with a positive x-value is D.

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The equation of a parabola with vertex (0, 0) can be written as

  y^2 = 4px

where p is the distance from the vertex to the focus. Here, that distance is 1.

a

step-by-step explanation:

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3

step-by-step explanation: