To disinfect 1 quart of stream water to make it drinkable, you need to add 2 tablets of iodine. How many tablets do you need to disinfect 4 quarts?

x = 8 tablets are needed to disinfect 4 quarts

Step-by-step explanation:

Write and solve an equation of ratios:

 1       2 tablets

=

  4             x

Cross-multiplying, we get x = 8 tablets are needed to disinfect 4 quarts

maximum area = xy = (16)(32) = 512 ft2

to maximize the area of the garden, the side of the fence parallel to the side of the house should be 32 ft long, and the other two sides should both have length 16 ft.'

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