The owner of a bike shop sells unicycle and bicycles and keeps inventory by counting seats and wheels. one day she counts 20 seats and 28 wheels. the equation representing the total number of seats is u+b=20 where u is the number of unicycles and b is the number of bicycles. select the equation representing the number of wheels.

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

I'm confused on this could anyone me and show me what i need to do to solve it.

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.