Answer:
b
Step-by-step explanation:
Using the trigonometric identity
• sin²x + cos²x = 1 , hence
cosx = ± 
cosΦ > 0 for 0 < Φ < 
cosΦ = 
= 
= 
= 
→ b
SOLUTION:
by putting x = 4y - 1 in the equation x + 2y = 11, we get;
=) 4y - 1 + 2y = 11
=) 6y = 11 + 1
=) y = 12/6
=) y = 2
Now that we got the value of y we can put the value in the equation x = 4y - 1.
=) x = 4(2) - 1
=) x = 8 - 1
=) x = 7
Hence, the value of x is 7 and y is 2.
Since b = 3 the equation changes
5a - 10(3) = 45
5a - 30 = 45
(Add 30 to both sides)
5a = 75
Divide 5 to both sides
a = 15
Answer:
5 Simplify the radical by breaking the radicand up into a product of known factors, assuming real numbers.
