Answer: x = 5
Step-by-step explanation: First distribute the 3 to get 9x +21 = 3x +51, then subtract 3x and 21 from both sides to get 6x = 30, and finally divide by 6 on both sides to get x = 5.
Hope this helps! :)
(x^2)/a^2+(y^2)/b^2=1
a>b
a=6, a^2=36
foci=(a^2-b^2)^(1/2)
4=(36-b^2)^(1/2)
16=36-b^2
b^2=36-16
b^2=20
b=2(5)^(1/2) or (20)^(1/2)
1=(x^2/36)+(y^2/20)
Answer:
the figure is in cuboidal shape.
volume of cuboid=length ×width ×height
volume of cuboid=12mi×5mi×4mi
volume of cuboid=240mi³
X=3/20 i think. if not so sorry