Its rational
Square root of 1.69 is 1.3 which is rational ( 1.3 = 13/10)
⇒ 
⇒ 
⇒
; sin(x) ≠ 0, cos(x) ≠ 0
⇒ 
; sin(x) ≠ 0, cos(x) ≠ 0
⇒ 
Use the Unit Circle to determine when
Answer: 45° and 315° 
The formula for volume of a sphere is (4/3)πr², with r being the radius. Since the diameter of the sphere is 18 cm, the radius is 18/2, which is 9. Now substitute the 9 for r so you have:
V=(4/3)π*9²
V=(4/3)π*81
V=108π
108π is the exact volume of the sphere.
Okay what you could do is type 400 divided by 2/3 into a calculator, but on paper you would do 400 divided by 3, which is 150, then multiply 150 by 2 since it’s “2/3’s” of 400.
400 / 3 = 150,
150 x 2 = 300, so 300 is correct.
