Respuesta :
Answer: B. 15
A rectangle has 4 sides, so width has two sides and length has two sides. Multiply 6 by 2 and get 12, subtract 12 from 42, then you get 30. Half of 30 is 15.
A rectangle has 4 sides, so width has two sides and length has two sides. Multiply 6 by 2 and get 12, subtract 12 from 42, then you get 30. Half of 30 is 15.