Answer:
Step-by-step explanation:
Given:
Right ∆ with,
Hypotenuse = x
Opposite = 9
Reference angle
= 39°.
Required:
The value of x
Solution:
Since we are given a reference angle with opposite length, and we are to find the hypotenuse length, x, apply the following trigonometric ratios formula:

Plug in the values into the equation

Multiply both sides by x

Divide both sides by sin(39)

(to 2 decimal places)
Answer:
4 or -4 !
Step-by-step explanation:
edit... isolate the variable, so divide 5 on both sides. then take the absolute value of d which is d. therefore d = 4 or -4! it's both positive and negative because absolute value you set it equal to a positive and negative!
Answer is B
4 square root of 2i