Question

1.The perimeter of a rectangle is 42cm. And its area is 20cm2

a) What is the sum of length and breadth?

b) Find the length and breadth of rectangle

2. Sum of two numbers is 9 and sum of their squares is 41.

Considering one of the numbers as x,

a) Write a second degree equation

b) Find the numbers

3. How many terms of the Arithmetic Sequence 5,7,9,...must be

added to get 140?​

Answer 1

Answer:

Step-by-step explanation:

1.a) l*b = 20 ; 2(l+b) = 42cm

(l+b) = 21cm

b = 21-l

Substituting 'b',

l(21-l) = 20

21l - l²=20

-l² + 21l -20 =0

l² -21l + 20 =0

l² -20l - l +20 =0

l(l-20) - 1(l-20) =0

(l-20)(l-1) = 0

Therefore, Length = 1cm ; Breadth = 20cm

Sum = 1+20 = 21cm.

MARK ME AS BRAINLIEST!!!! (:

Answer 2

Answer:

delete my questions please