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a student bought a book for $7.50 and a pen.the total cost was $9.50.which of the following can be used to find the cost of the pen?

a)p=7.5b
b)p=9.5b
c)9.50+p=7.50
d)7.50+p=9.50

Sagot :

julxaaaa
It is answer choice D.

7.50 + p = 9.50
-7.50        -7.50
the 7.50 and 7.50 cancel out and you are left with p=2.50 
thompzac
D: because if you take 9.50-7.50=2 you would get p=price or the price of the pen.
Hope I helped=)
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