Question

plzzzzzzzzzzzzzzzzz help in 21 and 22

Answer 1

Hello dear friend...

21.

Solution :

  Given,

          $\frac{5.6(x+3)}{0.7} = 24$

By simplifying the given equation,

     $\ 5.6(x+3)} = 24 *0.7 = 16.8\\\ x +3 = 16.8/5.6\\\ x +3 = 3\\\x = 0$

We have to find,

   2x +1

⇒2(0)+1 = 1

I was unable to understand '22.' problem....

Sorry very much....

Answer 2

Hi there!
Here's the answer:

•°•°•°•°•°•<><><<><>><><>°•°•°•°•°•
(21)

Given
[5.6(x+3)]/0.7 = 24
=> [(5.6/0.7)× (x+3)] = 24
=> 8(x+3) = 24
=> x+3 = (24/8)
=> x+3 = 3
=> x = 3-3 = 0

•°• 2(x) + 1 = 2(0) + 1 = 1

•°• (2)nd Option is the Correct answer

•°•°•°•°•°•<><><<><>><><>°•°•°•°•°•
(22)

¶¶¶ Step-1: Find Values of x and Y

There exists 10 possible cases for Unit digit of 'A':

Unit digit of :
A _____ A² ______ A³
0 ______ 0 _______ 0
1 _______ 1 _______ 1
2 ______ 4 _______ 8
3 ______ 9 _______ 7
4 ______ 6 _______ 4
5 ______ 5 _______ 5
6 ______ 6 _______ 6
7 ______ 9 _______ 3
8 ______ 4 _______ 2
9 ______ 1 _______ 9

Now,

x = No. of possible cases in which unit digit of A and A³ are the same

When Unit digit of A ={0, 1, 4, 5, 6}, Unit digit of A³ remains unchanged.

•°• x = 6

y= No. of possible cases in which unit digit of A² and A³ are the same

This is possible are when Unit digit of A = {0, 1, 5, 6}

•°• y = 4

¶¶¶ Step- 2: Find x-y

x - y = 6 -4 = 2

•°• (2)nd Option is the Correct Answer

•°•°•°•°•°•<><><<><>><><>°•°•°•°•°•

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:)

Hope it helps