Answer:
x = 15
Step-by-step explanation:
8x + 9 and 51 are same- side interior angles and sum to 180° , then
8x + 9 + 51 = 180
8x + 60 = 180 ( subtract 60 from both sides )
8x = 120 ( divide both sides by 8 )
x = 15
The average rate is 5 mps because 80 seconds times 5 equals 400 meters
Answer:
21
Step-by-step explanation:
It might be 21/30 , hope it helps though :)
