- A5, −7, −15
- B5, −3, −15
- C5, −7, 1
- D19, 7, −1
Step-by-Step Solution
The machine works out . For . For . For . Taking as 4 gives ; adding 7 instead of subtracting gives 19, 7, −1.
Answer: A) 5, −7, −15
Three number cards are fed into the machine one at a time. Each number is first multiplied by 4 and then 7 is taken away. Which list shows the three outputs, in the same order as the inputs?
Class 7Finding the Value of an ExpressionAlgebra
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