B is the answer because 9 times 2x is 18x and 9 times 5 is 45.
The answer is the second one, 6x2 - 4
area = ( top rule + bottom rule ) × height / 2
area = ( 2 + 3 ) × 4 / 2
area = 5 × 4 / 2
area = 20 / 2
area = 10
Answer: 30
Step-by-step explanation:
see photo for work
The mystery number will be 19.4596