Question

i have a number, if a, double the number and add 5 to it. the result is 21 find the number​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

let the number be x

ATQ, x*2+5=21

x^2= 21-5

$x {}^{2} = 16$

$x = \sqrt{16}$

$x = 4 is the answer$