The formula to find area would be length times height times width. In number six, the prism is 12 cm in length, 9 cm wide, and 5 cm high. So your equation would be 12 x 5 x 9. Your answer would be 540 cm squared.
Don't know about number seven, though
60 dollars rounded but it's really answer is 59.80 dollars
Hopes this helps if right please mark as brainlist:
Answer: -12x^2 + 15x
I’m confused?? Do you just need 1/3 of 12? That’s 4 because 12 x 1 =12 and 12/3 is 4 lol