Answer:
(a) 5 cm
(b) 156.5 cm
Step-by-step explanation:
1. In 5th grade, Ali was 136.5 cm, then in 6th, grade he was 141.5 cm. Now, in 7th grade, Ali is 146.5 cm. As you can see, Ali's height increases 5 cm per grade.
2. Since 9th grade is in two years, we add 10 cm to Ali's 7th grade height.
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