X1 10 M/C (QAT20)

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Which one of the following describes a Bernoulli random variable?

• The times achieved by athletes in a 100 m hurdles race

• The value of a card picked from a pack of playing cards

• Choosing a red pen from a case that contains red, blue and black pens

• The number of emails you receive in a week

What is the rate of change of the volume of a cube, when the side length of the cube is 4 cm and the surface area is increasing at 2 cm²s^-1 ?

• 1 cm³s^-1

• 2 cm³s^-1

• 8 cm³s^-1

• 18 cm³s^-1

The slope field for a first order differential equation is shown.

What could be the differential equation represented?

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Which of the following differential equations can NOT be solved by separation of the variables?