Joshua rode his bike 25 miles in 2 hours. i calculated how fast each person is traveling in miles per hour. brook can go 7 miles in 30 minutes, she can go 14 miles in 60 minutes, or 1 hour. joshua can go 25 miles in 2 hours, he can go 12.5 miles in 1 hour.

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

idk

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