An alloy is a metal made by combining two or more metallic elements. You mix an alloy that contains 14% copper with an alloy that contains 24% copper to make 100 pounds of an alloy that is 18% copper. How many pounds of the 14% alloy was used? A.6 pounds
B.16 pounds
C.40 pounds
D.60 pounds

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?

Use complete sentences to differentiate between a regular tessellation, and a pure tessellation. be sure to include specific types of polygons in your explanation.

How do newtons third law of motion demonstrates on a rollar coster