Answer:
234 cm²
Step-by-step explanation:
Given expression to represent the surface area of the rectangular prism is 
The given value of x is 3.
Now, finding value of expression by sustituting value of "x" as given.
Surface area of the rectangular prism = 
Surface area of the rectangular prism= 
∴ Surface area of the rectangular prism= 
Surface area of the rectangular prism= 
∴ Surface area of the rectangular prism= 234 cm²
Answer:
height ×base divided by two
Ummm there’s no right triangular
3x+5x-12=180
8x=180+12
8x=192
x=192/8
x=24
angle 1 = 5x-12
=5(24)-12
=120-12
=108
angle 2= 3x =3*24=72
angle 1 = angle 9
angle 9= 108
Answer:
x = 1, y = 1
Step-by-step explanation:
3x - 4y = -1
5x + 2y = 7
If we multiply the whole second equation by 2, we get:
10x + 4y = 14
Adding this to the first equation:
10x + 4y + 3x - 4y = 14 - 1
13x = 13
x = 1
Applying this to the second equation:
5 (1) + 2y = 7
2y = 2
y = 1