Which shows a perfect square trinomial?
502-4x2
100-36x? y
16x2+24 xy +9y2
49x2 - 70 xy +10y

Third choice.

Step-by-step explanation:

Trinomial means you have 3 terms.

You don't have 3 terms in first two choices so let's not look at them.

Anything of the form is a perfect square trinomial because it can be written as .

Let's this this:

Now foil!

First=ax(ax)=a^2x^2

Outer=ax*by=abxy

Inner=by*ax=abxy

Last=by*by=b^2y^2

Add together and this gives you a^2x^2+2abxy+b^2y^2.

So looking at third choice you can write it as 4^2x^2+24xy+3^2y^2.

Is 2*4*3 equal to 24?  If it is then you have your answer. It is.

We have our answer.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

id

step-by-step explanation:

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