Question

plz solve this problem ​

Answer 1

$<h1>SOLUTIONS:</h1>$

1)The formula use is

$a^{2} - b^{2} = (a - b)(a + b)$

Given:

$4x^{2} - 25y ^{2}$

=

$(2x)^{2} - (5y) ^{2}$

=

$(2x - 5y)(2x + 5y)$

2) SOLUTIONS:

Given: Length =45m and breath=40m

Area of rectangle is Length×Breath.

=45×40

=

$1800m^{2}$

So, area of rectangle is 1800m^2

3) SOLUTIONS:

First find the cost of 1 bicycle.

Given:16 bicycles cost 17600

To find the cost of 9bicycles.

Now cost of 1 bicycles is

=17600/16

=1,100

So, the cost of 1 bicycle is rupees 1,100

Now cost of 9 bicycles is 9×1,100

=9,900rupees

__________________________________

4) Given: Principal is =2,100

Rate=12%p.a

Time =2yrs.

Interest Formula=P×R×T÷100

=2,100×12×2÷100

=21×12×2

=504

So, interest after 2yrs is 504.