Question

can anyone do 21,22,23 please

Answer 1

Answer:

For 21

aim :t to find the least perfect square exactly divisible by each one of the numbers 4,5, 10.

=> fist let us find the lcm of 4,5 and 10

=>4 = 2*2

=>5 = 5*1

=>10 = 2*5

=>lcm = 2*2*5 (they are the prime factors

=>.20

20 is the lcm of 4 , 5 and 10

now multiply the prime factors so that all the prime factors will have even multiplicities.

=> the prime factors was2*2*5

=>2² *5

>now

=>2 ² * 5²

=>4 *25

=> 100

∴100 is the answer

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hope it helps u/////////////////////

Step-by-step explanation:

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Answer 2

Answer of 21:- 100 as it is the square of 10 which is least perfect square divisible by 4, 5 and 10

22:- angleACB=angleCAD(alternate angles)

Therefore x=30degree(alternate angles)

angle EGC=angle DAC( corresponding

angles

Therefore y=30degree

Angle ADC=angle CBA(vertically

opposite angle)

Therefore z=125degree

Hence,

x=30 degree

y=30 degree

z=125 degree

Hope it helps......