Question

sind the square of 46
16) if 21y5 is a multiple of 9, where y is a digit , what is value of y​

Answer 1

Answer:The divisibility test for  9  states that, “A number is divisible by  9  if and only if the sum of its digits is a multiple of  9 "

Step-by-step explanation:

That is, if the sum of the digits of a number is  9,18,27  etc., then only the number is divisible by  9  

The number given is  21y5  

So, first we will check whether the sum can be  9  

2+1+y+5=9  

8+y=9  

y=1  

So we got a non-negative number in the range  [0,9)  

Thus  y=1  will make the number divisible by  9  

Infact,

21159=235

Answer 2

Answer:

1.(46)^2

=46×46 =2116

2.The sum of all the digits must be divisible by 9

2+1+y+5=8+y The number to multiplicate with 9 is 1

y=1

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