Which is the best definition of a triangle? a. a figure formed by three segments connecting three noncollinear points b. a figure formed by four segments connecting four noncollinear points c. a figure formed by four collinear points d. a figure formed by three parallel segments

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

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm