Answer:
D. 
Step-by-step explanation:
We can see the shape can be cut into 4 right triangles. We can use pythagoreans theorem to find the length of the hypotenuse.
The distance from 0 to a represents one side, and the distance from 0 to b represents the other side.
So
(C represents the hypotenuse)
So the hypotenuse can be written as 
Since four of these lines make up the perimeter,
the total perimeter will be
Answer:
2y
Step-by-step explanation:
2x-3=2y
2x-2y=3
25/100
because the 1. is more than 25 so it go to 100th
Answer:
Step-by-step explanation:
If we take out the extra $3, we can group the bills into one each of $5 and $1, for a value of $6. There will be 7 such groups in the remaining $42.
That means there are 7 bills of the $5 denomination, and 3 more than that (10 bills) of the $1 denomination.
There are 7 $5 bills and 10 $1 bills.
_____
If you want to write an equation, it is usually best to let a variable stand for the most-valuable contributor. Here, we can let x represent then number of $5 bills. Then the value of the cash box is ...
5x +(x+3) = 45
6x = 42 . . . . . . . . subtract 3, collect terms
x = 7 . . . . . . . . . . . there are 7 $5 bills
x+3 = 10 . . . . . . . . there are 10 $1 bills
You may notice that this working parallels the verbal description above. (After we subtract $3, x is the number of $6 groups.)
