I NEED HELP!!! THIS IS DUE IN 10 MINUTES, AND THE ANSWER I KEEP FINDING IS WRONG! Everyone keeps giving me, "v= 1/3bh", but the machine keeps saying this big, fat, red, X! What else could possibly be the answer????

I NEED HELP THIS IS DUE IN 10 MINUTES AND THE ANSWER I KEEP FINDING IS WRONG Everyone keeps giving me v 13bh but the machine keeps saying this big fat red X Wha class=