Please help me with this

When the subject ends with an S, it is plural. When the subject does not end with an S, it is singular.

Singular , plural

Step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

the square root of 16 is 4.

4*4 = 16