kaylee0424
03.02.2020 •
Mathematics
She purchased 40% of the copies in the store. she has 80 copies of the cd. how many cd were on sale
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Ответ:
Let y be the number if CD.
As she bought 40%, the amount she bought= 40%y
The equation:
40%y = 80
0.4y = 80
y = 80÷0.4
y=320
Therefore there were originally 320 CDs.
Hope it helps!
Ответ:
(3/13)^2 + (4/13)^2 = (5/13)^2
9/169 + 16/169 = 25/169
25/169 = 25/169
answer
Yes. It is a right triangle