The owner of a bike shop sells unicycles and bicycles and keeps inventory by counting seats and wheels. one day, she counts 21 seats and 30 wheels. the equation representing the total number of seats is u + b = 21 where u is the number of bicycles and b is the number of bicycles.
a. 2u + b = 21
b. u + 2b = 30
c. 2u + b = 30
d. u + 2b = 21

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The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2