12) 2+3+4+5+6 = 20h.. she is paid 8.75 per hour. earnings would be 20h times 8.75 per hour (answer 5)
13) volume = area (base) times height = 2 * 3.5 * 5 there is no addition at all (answer 1)
14) 37 + 67 + unknown angle = 180... so unknown is 180-37-67 = 76 degrees (answer 3)