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Questions and Answers
What is the value of x when 2x - 5 = 15?
What is the value of x when 2x - 5 = 15?
- x = -5
- x = 10 (correct)
- x = 20
- x = 5
What is the area of a rectangle with length 8 cm and width 5 cm?
What is the area of a rectangle with length 8 cm and width 5 cm?
- 40 sq cm (correct)
- 20 sq cm
- 13 sq cm
- 56 sq cm
If a circle has a radius of 6 cm, what is its circumference?
If a circle has a radius of 6 cm, what is its circumference?
- 37.68 cm
- 12.56 cm
- 25.12 cm (correct)
- 18.84 cm
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Study Notes
Solving Equations
- To find the value of x in the equation 2x - 5 = 15, add 5 to both sides and then divide by 2, resulting in x = 10.
Rectangular Geometry
- The area of a rectangle is calculated by multiplying the length by the width.
- The area of a rectangle with a length of 8 cm and a width of 5 cm is 8 cm × 5 cm = 40 cm².
Circular Geometry
- The circumference of a circle can be calculated using the formula C = 2πr, where r is the radius.
- The circumference of a circle with a radius of 6 cm is C = 2π(6 cm) = 12π cm or approximately 37.7 cm.
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