Åk 6–9
  • Start
  • 1. Welcome to Formulas and Functions
  • 2. Concepts
  • 3. From Pictures to Formulas
  • 4. Calculating with Formulas and Functions
  • 5. Second Degree Functions
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    English/Polski
    4.4 Exercises – Calculating with Formulas and Functions
    1. Circles
     

    The formula for a circle’s circumference (perimeter) is C = p · d. Calculate the radius of the circle with a circumference of  45 cm.
       
     
    		 
    2. Rectangles

    The formula for a rectangles area is A = bh. Calculate h in a rectangle with an area of 180 cm2 and where b is 15 cm long.
     
    		 
    3. Function of a Straight Line
    As what point does the line intersect the y-axis?
    a) y = 3x - 7
    		 
    b) y = -5x
    c) y = 2x + 4
    d) 2y = 4x - 6
    		 
    4. Parallel Lines

    If two lines are parallel then there gradients are:

    		 
    5. Parallel Lines

    Which of the following lines are parallel?

    a) y = 2x - 4
    b) y = -5x - 1
    c) y = -2x - 4
    d) y = 7 + 2x
    e) 2y = 4x - 8
    f) y = 3 - 5x
    		 
    6. Proportionality

    Do the following functions describe a proportionality? Answer “Yes” or “No”.
    a) y = 5 - 7x
    b) y = -6x
    c) 3y + 3 = 3 - 15x
    d) 2y = 4x - 8