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Maths-

General

Easy

Question

A man $2 blank m e t r e s$ tall walks away from a lamp post $5 blank m e t r e s$ height at the rate of 4.8 km/hr. The rate of increase of the length of his shadow is

$1.6 \frac{k m}{h r}$
$6.3 \frac{k m}{h r}$
$5 \frac{k m}{h r}$
$3.2 k m / h r$

The correct answer is: $3.2 blank k m divided by h r$

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A spherical balloon is being inflated at the rate of 30 $c c to the power of blank divided by m i n$ . The rate of increase of the surface area of the balloon when its diameter is 14cm, is

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$R$ : If a differentiating function decreases in $open parentheses a comma blank b close parentheses$ then its derivative also decreases in $open parentheses a comma blank b close parentheses$

Which of the following is true?

Consider the following statements $S$ and $R$ :
$S$ : Both $sin invisible function application x$ and $cos invisible function application x$ are decreasing function in $open parentheses fraction numerator pi over denominator 2 end fraction comma pi close parentheses$

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