FreddyNoTalKing
29.01.2020 •
Mathematics
Can someone me this is my last question of the 5. use the properties of real numbers to rewrite the expression. 2/5 * (-7) * 5/2 a. 1 b. -1 c.5 d. -7
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Ответ:
Step-by-step explanation:
Givens
The woman have 21 total coins.The coins are distributed between dimes ad quarters.The total value of her change is $3.90.With this information we can construct a system of equations, where
is dimes and 
is quarters.
Now, we know that one dime values 10 cents, and one quarter values 25 cents.
Then, we isolate
in the first expression
And we substitute it in the second expression
Then, we use this value to find the other one
Therefore, the woman has 12 quarters and 9 dimes.