Which characteristic is used to measure the amount of light radiated by a star?
size
color
luminosity
temperature

luminosity

Explanation: Luminosity is used to measure the amount of light radiated by a star. It is the total amount of emery or light emitted per unit of time by a star. Or it is the total energy a star produces in one second from its surface.

It is used as the measure of brightness.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

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