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  1. When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

  2. B: Triangular prisms and rectangular prism have the same number of bases

    Step-by-step explanation:

    a triangular prisms has two bases in a form of a triangle and a rectangular prisms has two bases also in a from of a square  

  3. m = 3 n = 20 triList = [] current = 0 for i in range(1, n + 1):    current = current + i      if(current >= m and current <= n):        triList.append(current) print(triList)

    Explanation:

    The solution code is written in Python 3.

    Firstly, create variable m and n and set the value 3 and 20 to the variables (Line 1 -2)

    Create a triangle number list (Line 4)  and another variable current to hold the value of current total of triangle number (Line 5).

    Create a for loop and iterate through the number between m and n (Line 6).  Calculate the current total of triangle number (Line 7) and proceed to check if the current triangle number is bigger or equal to m and smaller and equal to n, add the current triangle number to triList (Line 8-9).

    Print the triList (Line 11) and we shall get [3, 6, 10, 15]

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