Question

the number 21x09 is equal to 22000 correct to 2 significant figures.find the value of x if 21x09 is a perfect square​

Answer 1

Given: The number 21x09 is equal to 22000 correct to 2 significant figures.

To find:  The value of x if 21x09 is a perfect square​

Solution:

• Now we have given the number 21x09 is equal to 22000.

• It correct to 2 significant figures.

• So x will be greater than or equal to 5.

                   x ≤ 5

• So possible numbers are:

                   21509

                   21609

                   21709

                   21809

                   21909

                   √21609 = 147

                   21609 is a perfect square.

• So the value of x is 6.

Answer:

           So the value of x is 6.

Answer 2

Answer:

147

Step-by-step explanation:

Given : The number 21 × 09 is equal to 22000 correct to 2 significant figures.

To find : The value of x if 21 × 09 is a perfect square

Solution :

• Now we have given the number 21×09 is equal to 22000
• It is correct to 2 significant figures.
• So x will be greater than or equal to

x ≤ 5

• So possible numbers are :

21509

21609

21709

21809

21909

√21609 = 147