Abox of 6 trophies costs 5$. how much would it cost to buy 48 trophies ?

The cost of 48 trophies is required.

The cost of 48 trophies would be 40$.

Cost problems

One box contains 6 trophies which costs 5$

Divide both sides by 6

For 48 trophies multiply the above equation by 48 on both sides

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Ah, this is simple multiplecation, on both sides. 
You have a box of 6 trophies, and it costs 5 bucks.
Well, you should know that 6*8=48
So, if 6*8=48 trophies, then multiply 5 bucks *8, which gives you 40

$40 for 48 trophies.

~Hope this helps!

She will need 5/8 bags for each square yard.

Yes the slope to this is -5