The area of a square is its side length squared. So the side length of the square squared is 42, so the side length of the square is sqrt(42). The perimeter of the square is 4 times the side length, or 4sqrt(42), which is approximately 25.92.
Answer:
Step-by-step explanation:
8(9x-11)
72x-88
The answer is...........b)5
Answer:
(-4,-2) and (3,19)
Step-by-step explanation:
We want to solve the system:
We equate the right hand sides:
Rewrite is standard quadratic form.
This simplifies to:
We factor:
When x=3,
Hence a solution is (3,19)
When x=-4,
Another solution is (-4,-2)
Answer:
C and D.
Step-by-step explanation:
Check each one using x = 60 degrees:
A. tan(x/2) = tan 30 = 0.5774
1 - cos 60 / sin 60 = 0.5774 So A is an identity
B. sin 60 / (1 + cos 60) = 0.5774 :- B is an identity.
C. cos 60 / ( 1 - sin 60) = 3.732 so This is NOT an identity.
D +/-sqrt( (1 - cos60)/(1 + cos 60)) = +/- 0.5774. Because oif the +/- I don't think this is an identity. Sorry I can't be sure.
