HELP ASAP!!!!! If the big triangle below has an area of 20 m squared what does x equal

Answer:
[tex]20 = (x + 1) \times 10 \times 0.5 \\ = 5 \times (x + 1) \\ x + 1 = 20 \div 5 = 4 \\ x = 4 - 1 = 3 \\ enjoy \: it[/tex]