Andrew had a collection of 300 baseball cards at the beginning of the summer After the summer Andrew had traded some of his baseball cards and know he only has 213 baseball cards What percent is the decrease of his baseball cards collected

The percentage decrease is 29%

Step-by-step explanation:

Given

Required

Determine the percentage decrease

This is calculated as thus:

Substitute values for Final and Initial

Get absolute value of -87

Hence, the percentage decrease is 29%

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: