Answer:
<em>The expression for final cost of the DVD is 
</em>
Step-by-step explanation:
Jessica purchased a DVD that was on sale for 12% off.
If the original price of the DVD is 
, then the amount of discount on sale will be: 
So, the selling price of the DVD 
The sales tax in her county is 3%. So, the amount of sales tax on the selling price will be: 
Thus, the expression for final cost of the DVD is: 
Answer:
y=4
Step-by-step explanation:
5
8
6 or 7
Just taking a guess
Answer:
x = 13
39° and 51°
Step-by-step explanation:
Angles in a triangle add up to 180 degrees.
This is a right angle triangle, so one side has a size of 90 degrees.
3x + 4x - 1 + 90 = 180
7x + 89 = 180
7x = 91
x = 91/7
x = 13
Put x as 13 to work out the size of the angles.
3(13) = 39
4(13) - 1
52 - 1 = 51
Answer:
The area of a rectangle with length of 5 and width of 5.
Step-by-step explanation:
A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself.
area = lxw
A=5x5 (5 times itself)
A=25
therefore it is a perfect square
