Which expression can be used to find the area of triangle rst? (8 ∙ 4) - 1/2 (10 + 12 + 16) (8 ∙ 4) - (10 + 12 + 16) (8 ∙ 4) - 1/2 (5 + 6 + 8) (8 ∙ 4) - (5 - 6 - 8)

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

step-by-step explanation: