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31. Simplify: 21 – 9 ÷ (-3). 32. If each liter of gasoline costs ₱42.65, how much will 5.2 liters cost to the nearest centavo? 33. What is the smallest positive integer by which 108 can be multiplied to make it a perfect square? 34. Starting at the middle step of the ladder, a fireman goes up by 7 steps, and down by 11 steps, up again by 6 steps, , down by 7, finally up by 12 and found that he is on top of the ladder. How many steps are there in the ladder?
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Do you expect us to see what you see, show us a picture or tell us what number 30 to 34 is
32. If each liter of gasoline costs ₱42.65, how much will 5.2 liters cost to the nearest centavo?
33. What is the smallest positive integer by which 108 can be multiplied to make it a perfect square?
34. Starting at the middle step of the ladder, a fireman goes up by 7 steps, and down by 11 steps, up again by 6 steps, , down by 7, finally up by 12 and found that he is on top of the ladder. How many steps are there in the ladder?