Question

Can anyone answer for the 5th question, quickly?

Answer 1

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Here, the concept of Arithmetic Progression (A.P) is used

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Here,

a = 10

d = -2

${a_{n}}$ = -8

n =?

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$\boxed{a_{n} = a + (n-1)d}$

So,

-8 = 10 + (n-1)(-2)

-8 = 10 -2n +2

-8 = 12 - 2n

-8 - 12 = -2n

-20 = -2n

n = 10

This implies after 10 hours, temperature would be -8°C

=> It would be -8°C at 10pm

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What would be the temperature at midnight?

Here,

a = 10

d = -2

n = 12

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Using the formula, we get

${a_{12}}$ = 10 + (12-1)(-2)

${a_{12}}$ = 10 + 11(-2)

${a_{12}}$ = 10 - 22

${a_{12}}$ = -11

Hence, the temp. at midnight = -11°C

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Answer 2

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