X= fancy, y= plain
x+y= 7
28x+ 15y=131
solve by substitution
Answer:
i dont know the answer sry
Step-by-step explanation:
srryyy
To get the congruent angles we shall use the sine rule since we have the length of at least 1 side and the values of the angles.
Base length=12 inches
Base angles=50°
Third angle=180-(100)=80°
thus applying the sine rule we shall have:
a/sin A=b/sin B=c/sin C
thus we can get the congruent side as follows:
a/sin 50= 12/sin 80
a=(12 sin 50)/sin 80
a=9.334 inches
since the sides are congruent then the other congruent side will have a length of 9.334 inches
208.81 square centimeters of aluminium are needed
<em><u>Solution:</u></em>
Given that,
Radius = 3.5 cm
Height = 6 cm
We have to find the square centimeters of aluminum needed
So we have to find the surface area of cylinder
<em><u>The surface area of cylinder is given by formula:</u></em>
![A = 2 \pi r(h+r)](https://tex.z-dn.net/?f=A%20%3D%202%20%5Cpi%20r%28h%2Br%29)
Where "r" is the radius and "h" is the height of cylinder
<em><u>Substituting the values we get,</u></em>
![A = 2 \times 3.14 \times 3.5 \times (6+3.5)\\\\A = 21.98 \times 9.5\\\\A = 208.81](https://tex.z-dn.net/?f=A%20%20%3D%202%20%5Ctimes%203.14%20%5Ctimes%203.5%20%5Ctimes%20%286%2B3.5%29%5C%5C%5C%5CA%20%3D%2021.98%20%5Ctimes%209.5%5C%5C%5C%5CA%20%3D%20208.81)
Thus 208.81 square centimeters of aluminium are needed
The answer would be 5,875.00