Question

answer this question​

Answer 1

Answer:

11)lb

12) 2pie r

13) yz

14) a²-9

15)a^mn

Step-by-step explanation:

pls mark brainliest

Answer 2

Answer:

Q11

Given

• Length = l
• Breath = b

$\bold \pink{Area \: of \: Rectangle = Length×Breath}$

$\sf{ \to \: Area \: of \: Rectangle = l×b} \\ \\ \sf{ \to Area \: of \: Rectangle = lb}$

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Q 12.

Given

• Radius= r

$\sf{ \to Perimeter \: of \: circle = circumference \: of \: circle}$

$\sf{\to perimeter\:of\:circle= 2πr}$

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Q 13.

$\sf{ \to\frac{x}{y} = \frac{z}{w}}$

Cross multiply

$\sf{ \to xw = zy}$

⚘Therefore xw is equal to zy.

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Q 14.

(a-3)(a+3)

$\mathtt{ \to \red{Use \: algebric \: identity \: (a+b) (a-b) = a²-b²}}$

$\sf{ \to (a-3)× (a+3)= a²-3²} \\ \\ \sf{ \to(a-3)× (a+3)= a²- 9}$

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Q 15.

$\sf{ \to a^{m} ×a^{n} }$

here the concept of exponent and power is used. When bases are same and multiplied then the powers get added.

so

$\sf{ \implies \red{a^{m} ×a^{n} = a^{m+n}}}$

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