Perpendicular angles are where 2 lines form 90 degree angles, such as in C
Variance = square of standard deviation
Variance = (2.5)^2 = 6.25 = 6.3 to the nearest tenth.
Consider the given quadratic equation 

Comparing the given quadratic equation to the general equation
, we get a= 1, b=0 and c= -50
So, the solution to the quadratic equation is given by:





So, the solutions to the given quadratic equation are
.
Short answer: - 1
The first thing you should do is draw this or get a program to do it. I use desmos. It is included. The graph shows one complete cycle every 2*pi intervals (or 360 degrees.)
You will find no lower value that y = - 1 (nor any value greater than y = 1)
Greater than symbol is ">"
But since he mentioned "NO greater than" then it's the opposite of greater than, which means "K" is less than "9"
K<9