Consider the dilation. Remember what we've discussed about the notion for the original figure and the figure after it has undergone transformation

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we are given scale of 2 units.

on graph paper the space is 2.5 cm.

length of glass = 8 units.

8 units = 2 units +2 units +2 units +2 units.

each 2 unit is = 2.5cm.

therefore,

8 units = 2 units +2 units +2 units +2 units = 2.5+2.5+2.5+2.5= 10cm.

therefore, the height of the the actual glass in cm is 10 cm.

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To find the  unit rate, divide the numerator and denominator of the given  rate  by the denominator of the given  rate. so in this case, divide the numerator and denominator of 70/5 by 5, to get 14/1, or 14 students per class, which is the  unit rate.