how many license plates consist of 2 letters followed by 2 digits, if one of the digits must be odd and the other must be even?

Describe the relationship between the angles of similar triangles and the sides of similar triangles

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Roger could feed 5 walruses with 4 kilograms of fish. how many walruses could he feed with 7.2 kilograms of fish?