Question

2. If A = (10.0 +-0.1) and B = (5.0 +- 0.1), then
2A - B is equal to
(1) (15.0 + 0.3) (2) (15.0 + 0.1)
(3) (10.0 + 0.3) (4) (20.0 + 0.3)​

Answer 1

Answer:as A=(10.0+-0.1),then 2A=(20.0+-0.2)

B=(5.0+-0.1)

2A-B= (20.0-5.0)+-(0.2-0.1)

=15.0+-0.1

Explanation:

Answer 2

Answer:

(2) (15.0 + 0.1)

Explanation:

As per the question,

Given data are

A = (10.0 ± 0.1)

B = (5.0 ± 0.1)

Now,

If A = (10.0 ± 0.1) than 2 times of A,

2A = 2 (10.0 ± 0.1)

     = 2 × (10.0) ± 2(0.1)

     = 20.0 ± 0.2

According to question we have to find the value of 2A - B.

So,

2A - B

= (20.0 ± 0.2) - (5.0 ± 0.1)

= (20.0 - 5.0) ± (0.2 - 0.1)

= 15.0 ± 0.1

That is 2A - B = (15.0 ± 0.1)

Hence, the correct option is (2).