Answer:
27.5
Step-by-step explanation:
tens ones . tenths hundredths thousandths
2 7 . 5 3 9
Rounding to the nearest tenth means we look at the hundredth
3 <5 so we leave it alone
27.539 rounds to 27.5
Answer:
18
Step-by-step explanation: Each side on a square its the same to the other one, so 72 divided by 4 its equal to 18
Question 1: Both are solutions.
Question 2: (4, 0)
There are lots of possibilities...
888888 and 889888
111111 and 112111
111111 and 113111
111111 and 114111
111111 and 115111
121212 and 123212
236423 and 237423
And there are lots more...
If you want more, just ask
Answer:
a) 
b)

c)

d)
cos 330° = 1- 2 sin² (165°)
Step-by-step explanation:
<u><em>Step(i):-</em></u>
By using trigonometry formulas
a)
cos2∝ = 2 cos² ∝-1
cos∝ = 2 cos² ∝/2 -1
1+ cos∝ = 2 cos² ∝/2

b)
cos2∝ = 1- 2 sin² ∝
cos∝ = 1- 2 sin² ∝/2

<u><em>Step(i):-</em></u>
Given

we know that trigonometry formulas

1- cos∝ = 2 sin² ∝/2
Given

put ∝ = 315

multiply with ' 2 sin (∝/2) both numerator and denominator

Apply formulas

1- cos∝ = 2 sin² ∝/2
now we get

b)

put ∝ = 330° above formula



c )

put ∝ = 315° above formula


d)
cos∝ = 1- 2 sin² ∝/2
put ∝ = 330°

cos 330° = 1- 2 sin² (165°)