Answer: h=3.5
Step-by-step explanation: Let's solve your equation step-by-step.
18.9=( 1/ 2 (6.8+4))(h)
Step 1: Simplify both sides of the equation.
18.9=5.4h
Step 2: Flip the equation.
5.4h=18.9
Step 3: Divide both sides by 5.4.
5.4h /5.4 = 18.9 /5.4
h=3.5