Substitute x = 9.4, y = -1.7, and z = 4.8 into the expression 2y² - 4x + 8z.

David bought a poster for an art project. the poster is 2.7 feet wide and 3.9 feet tall. what is the area of the poster?

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?

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?