Use multiplying by 1 to find an expression equivalent to 15 Over 19 with a denominator of 19 z19z.

The equivalent expression is ..........

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z/z = 1

so, multiply by that.

To find an expression equivalent to 15/19 with a denominator of 19z, you can use the concept of multiplying by 1. The key idea here is that multiplying any number by 1 does not change its value.

To change the denominator to 19z, we need to multiply both the numerator and denominator of 15/19 by a suitable expression that includes 19z.

To do this, we can multiply both the numerator and denominator by z. This is because multiplying by z will give us a denominator of 19z, as desired.

So, the equivalent expression is:
(15/19) * (z/z)

Multiplying the numerator and denominator gives us:

(15 * z) / (19 * z)

Therefore, the equivalent expression is:
(15z) / (19z)