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A) Here is a number machine.

Input
9
x 2
Work out the output when the input is 9.
b) Here is the same number machine.
Input
+3
x 2
+3
Work out the input when the output is 17.
Output
C
Output
17

A) Here is a number machine. Input 9 x 2 Work out the output when the input is 9. b-example-1
User Bschmitty
by
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1 Answer

5 votes

Answer:

21 and 7

Explanation:

(a)

to calculate the output follow the instructions from left to right, that is

9 × 2 = 18 , then 18 + 3 = 21

(b)

to calculate the input given the output

Do the reverse operations from right to left , that is

- 3 followed by ÷ 2

17 - 3 = 14 , then 14 ÷ 2 = 7

User Freya Ren
by
3.7k points