Can some one explain how to do this?

see explanation

Step-by-step explanation:

Using the tangent and sine ratios in the right triangle EFG

tan60° = = = ( multiply both sides by EG )

EG × tan60° = 28 ( divide both sides by tan60° )

EG = ≈ 16.2 in ( to the nearest tenth )

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sin60° = = = ( multiply both sides by EF )

EF × sin60° = 28 ( divide both sides by sin60° )

EF = ≈ 32.3 in ( to the nearest tenth )

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.