How do you find the square roots of a number?

the square of a number is that number times itself idk if that makes sense but fro example the square root of 16 would equal 4, the square root of 25 would equal 5

Step-by-step explanation:

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm