I only have answers for the first two…
question 4) B
question 6) B
Answer:


Step-by-step explanation:
Given : sin θ = 3/5
To Find : value of cos θ and tan θ
Solution :
use the identity:

putting value of sin θ
⇒ 
⇒
⇒
⇒
⇒
⇒
Thus , 
Now to find value of tan θ
Since we know that
⇒
(identity)
⇒
⇒
⇒
⇒
Thus , the value of


One third = two sixths
1/6 + 1/6 = 1/3
Answer:
√7i = x
Step-by-step explanation:
x²+y²=9;
y² = 9-x²
y = √(9-x²)
As line is given by y= 4, the solution of the system is:
4 = √(9-x²)
16 = 9-x²
7 = -x²
-7 = x²
√-7 = x
As √-7 doen't exist, you should use i = √-1;
Thus,
<em>√7i = x</em>
<em></em>
I hope it helps!
I do not know because I am 8 years old sorry