Answer:
a
Step-by-step explanation:
Letter A. For Barbara to convert 78F to Celsius. She must subtract 32 from 78. then multiply it by 5/9.
Step 1:
78 °F - 32 = 46
Step 2:
Multiply 46 by 5/9
Then, the answer is
Multiply 46 by 5/9.
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