39=1/2h(4+9)

find h

do you distribute the 1/2h or solve the () first?

39=1/2h*(4+9), solve (4+9) first 39=1/2h*13, divide both sides by 13 13=1/2h, multiply by 2 to get h=26 Hope that it helped you, if it did, mark my answer as Brainliest, thanks :)