a paper boy delivers papers. he delivers "189" papers in 3 hours. what is the unit rate of this deliveries per hour?

The paperboy delivers 63 papers per hour.

First, you must set up the equation.

Then, you must cross multiply.

Then, divide 3 on both sides.

-6 is the correct option from the above given options

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