Given:
recipe: 2 tsp of butter
Melinda wants to make 40% more servings than the recipe.
2 tsp is equal to 100%
additional of 40% makes it 100% + 40% = 140%
140% * 2 tsp = 2.8 tsp.
The expression that shows the number of teaspoons needed is:
D. 1.4 x 2