Question

A circular stadium consists of sections as illustrated, with aisles in between. The diagram show the tiers of concrete steps for the final section, Section K. Seats are to be place along every step, with each seat being 0.45cm wide. AB, the arc at the front of the first row is 14.4m long, while CD, the arc at the back of the back row is 20.25m long.

Answer 1

Answer:

A={−2,−1,0,1,2,3,4,5,6}

(ii) B={x:x is a natural number less than 6}

The natural numbers less than 6 are 1,2,3,4,5 

So, the elements of this set are 1,2,3,4, and 5 only.

Therefore, the given set can be written in roster from as

B={1,2,3,4,5}

(iii) C={x:x is a two-digit natural number such that the sum of its digits is 8}

The elements of this set are 17,26,35,44,53,62,71 and 80 only.

Therefore, this set can be written in roster form as

C={17,26,35,44,53,62,71,80}

(iv) D={x:x is a prime number which is a divisor of 60}

2∣602∣30

3∣15

5∣5

∣1

∴60=2×2×3×5

∴ The elements of this set are 2,3, and 5 only.

Therefore, this set can be written in roster form as D={2,3,5}.

A={−2,−1,0,1,2,3,4,5,6}

(ii) B={x:x is a natural number less than 6}

The natural numbers less than 6 are 1,2,3,4,5 

So, the elements of this set are 1,2,3,4, and 5 only.

Therefore, the given set can be written in roster from as

B={1,2,3,4,5}

(iii) C={x:x is a two-digit natural number such that the sum of its digits is 8}

The elements of this set are 17,26,35,44,53,62,71 and 80 only.

Therefore, this set can be written in roster form as

C={17,26,35,44,53,62,71,80}

(iv) D={x:x is a prime number which is a divisor of 60}

2∣602∣30

3∣15

5∣5

∣1

∴60=2×2×3×5

∴ The elements of this set are 2,3, and 5 only.

Therefore, this set can be written in roster form as D={2,3,5}.

Answer 2

$\huge\boxed{\dag\sf\red{ANSWER}\dag}$

Given:

• A circular stadium consists of sections as illustrated, with aisles in between. The diagram show the tiers of concrete steps for the final section, Section K. Seats are to be place along every step, with each seat being 0.45cm wide. AB, the arc at the front of the first row is 14.4m long, while CD, the arc at the back of the back row is 20.25m long.

• refer the attachment

$\huge\boxed{\dag\sf\red{Thanks}\dag}$