Whether the dilation is an enlargement or a reduction? What is the scale factor?

Write the algebraic representation for the dilation?

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In a certain pentagon, the interior angles are a, b,c, d,e where a, b,c, d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

The circumference of a circle is 5 pi cm. what is the area of the circle?

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5