Look at attachment for question.

A. 10

Step-by-step explanation:

Since we can find the scale factor of 1:2 through sides b and d, with b being half of d. With this information, we now know that c is double of a. So we can say that c is 5 x 2 = 10

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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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.