N/d = 15
d= 4 + 3n
d=n/15
n/15=4+3n
n=60+45n
44n=-60
n=-15/11
-15/11 / d = 15
-15/11 = 15d
d=-1/11
15/11 / 1/11. = 15
Answer: 6
Step-by-step explanation:
The answer to this would be A: -9/10. Hope this helps!
If this is supposed to be

Then this can simply be reduced to

by the double angle formula for cosine
Lisa's cut will be represented by the equation y = 1/4x + 4