En un mercado se tienen solo dos tipos de trigos (Duro y Blando). El 45% del trigo es Duro, el 25% del trigo duro es importado y el 20% del trigo blando es de producción nacional.

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/4zZs6GM

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

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