Answer:
<D is correct its confusing on the solving but
Step-by-step explanation:
It mean 40 because it is in the tens place
~Jz
Answer:
a) -6
b) 9
c) 27
Step-by-step explanation:

Answer:
dy/dx = -b/a cot α
Step-by-step explanation:
x² / a² + y² / b² = 1
Take derivative with respect to x.
2x / a² + 2y / b² dy/dx = 0
2y / b² dy/dx = -2x / a²
dy/dx = -b²x / (a²y)
Substitute:
dy/dx = -b²a cos α / (a²b sin α)
dy/dx = -b cos α / (a sin α)
dy/dx = -b/a cot α