D=Disc
13+10d=83
10d=83-13
10d=70
D=70/10
D=7
7+1=8
Maria purchased 8 CDs. Hope this helps!
Answer:
240 inches squared
Step-by-step explanation:

7 9/12 = 7.75
2 11/12 = 2.917
So we can round both of these up.
7.75 rounds to 8
2.917 rounds to 3
8 + 3 = 11
So the estimated sum is 11.
7 9/12 + 2 11/12 = 10 2/3
So the actual sum is 10 2/3.
The estimated sum is a pretty good estimate to the original number.
We need to find the two equations that represents the total amount of coins Carl has that makes $26.00 and the number of quarters and dimes.
Carl has 35 dimes and 90 quarters. The equations are
and
.
Let the number of dimes be 
Let the number of quarters be 
The total number of coins is 
So, the first equation will be

The value of the coins is $26. So,

Let us solve the equations



The number of dimes is 35 and the number of quarters is 90.
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the total number of pennies Kate's have can be known by adding all the pennies.
=787 + 292
=1079
the nearest round off of the pennies is 1000