Math, asked by mohithmohith857, 6 months ago

So, we givil II U
EXERCISE 1.1
q.
1
of the
(ii) The amount of air present in a cylinder when a vacuum pump removes
4
air remaining in the cylinder at a time.
(ii) The cost of digging a well after every metre of digging, when it costs * 150 for the
first metre and rises by * 50 for each subsequent metre.
(iv) The amount of money in the account every year, when 10000 is deposited at
compound interest at 8 % per annum.
2. Write first four terms of the AP, when the first term a and the common difference d are
given as follows:
(i) a=10, d=10
(ii) a=-2, d=0
1
(iii) a=4, d=-3
(iv) a=-1, d=
2
(v) a=-1.25, d=-0.25
3. For the following APs, write the first term and the common difference:​

Answers

Answered by Anonymous
6

Answer:

(i) Fare for first km = Rs. 15

Fare for second km = Rs. 15+8= Rs 23

Fare for third km = Rs. 23+8=31

Here, each subsequent term is obtained by adding a fixed number (8) to the previous term.

Hence, it is in A.P.

(ii) Let us assume, initial quantity of air =1 .....1)

Therefore, quantity removed in first step =

4

1

Remaining quantity after first step

1−

4

1

=

4

3

....2)

Quantity removed in second step

=

4

3

×

4

1

=

16

3

Remaining quantity after second step

=

4

3

16

3

=

16

9

....3)

Here, each subsequent term is not obtained by adding a fixed number to the previous term.

Hence, it is not an AP.

(iii) Cost of digging of 1

st

meter =150

Cost of digging of 2

nd

meter =150+50=200

Cost of digging of 3

rd

meter =200+50=250

Here, each subsequent term is obtained by adding a fixed number (50) to the previous term.

Hence, it is an AP.

(iv) Amount in the beginning = Rs. 10000

Interest at the end of 1

st

year @ 8% = 10000×8%=800

Thus, amount at the end of 1

st

year =10000+800=10800

Interest at the end of 2

nd

year @ 8% = 10800×8%=864

Thus, amount at the end of 2

nd

year =10800+864=11664

Since, each subsequent term is not obtained by adding a fixed number to the previous term; hence, it is not an AP.

Answered by Ridhdi
1

Answer:

the first answer is absolutely correct.......!!!!!

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