1
Speed Grid (-): Fill in each cell by applying the operation to the row and column headers. Row headers: [2, 5, 2, 2], Column headers: [2, 7, 5, 9] =
2
Speed Grid (+): Fill in each cell by applying the operation to the row and column headers. Row headers: [1, 8, 4, 9], Column headers: [7, 6, 9, 4] =