Answer:
2×r+10 and 3×r+1
Explanation:
a. 9+20= 29
b. 2×9+10= 18+10 = 28
c. 4x9-10 = 36-10 =26
e. 3×9+1 = 27 +1 = 28
the correct answer are 2×r+10 and 3×r+1
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