Andre is running in an 80-meter hurdle race. There are 8 equally-spaced hurdles

on the race track. The first hurdle is 12 meters from the start line and the last

hurdle is 15.5 meters from the finish line. Estimate how far the hurdles are from

one another.

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 answer is d

hope this