Answer:
The answer is 96 cm^2
Step-by-step explanation:
A cube can be seen as a 3D shape formed by sticking together 6 squares.
So the surface area would be the area of one of those squares multiplied by 6.
Then
16 cm^2 * 6 = 96 cm^2
The answer is 118 degrees
<span>30.5−20.4
-------------</span>=10.1−10<span>
<span>1999−2009</span></span>
X=one type that cost 9
y=one type that cost 8
total books=type1+type2
total books=13
x+y=13
the total cost=cost of each added together
cost of each=number of books times cost per book
total cost=108
9x+8y=108
we have
x+y=13
9x+8y=108
solve for x and y
multiply first equation by -8 and add to first equation
-8x-8y=-104
<u>9x+8y=108 +</u>
x+0y=4
x=4
subsitute
x+y=13
4+y=13
minus 4
y=9
4 of the $9
9 of the $8
thats how to solve
Perpendicular because when graphed, it creates a cross, or an intersection at a 90 degree angle