Alex stocks up for winter. he buys 36 cans of vegetables. he pays 80 cents per can for tomatoes and 40 cents per can for corn, for a total cost of 20.80 how many cans of tomatoes does he buy?

0.8 T + 0.4 C = 20.80
      
0.8 T + 0.4 (36-T)  = 20.80

0.8 T + 14.4 - 0.4 T = 20.80

0.4 T                    =   6.4

T                           =   16

Hope this helps
 

The appropriate choice is ...
  A. 3 radians


Arc length (s) is given in terms of radius (r) and central angle (θ) in radians by the formula
  s = rθ

When you substitute your given information, you have
  3r = rθ
Dividing by r gives
  θ = 3 . . . . . . . radians