When conducting an experiment for a new heart burn medicine, researchers randomly assigned patients to take either the new drug, an existing heart burn medication, or a placebo. All medications looked the same, and patients were not told which one they received. Was this experiment blinded?

a) No, because the rearchers knew who got which medication
b) No, because it was double blinded
c) Yes, because a control group was used
d) Yes, because the patients don't know which medication they received

Length of cable for guy wire = 153.39m

Step-by-step explanation:

I have attached a diagram that depicts this question.

From the diagram i attached,

Solving for angle B on the right triangle, we have;

∠B = 180° - 90° - 58°

∠B = 32°

Now, solving for angle B on the oblique triangle above the right triangle to give;

∠ABC = 180° - 32°

∠ABC = 148°

Solving for angle C on the oblique triangle

∠C = 180° - 148° - 12°

∠C = 20°

from the diagram b is the length of cable for the guy wire.

c is given as 99m

Thus,using sine rule, we have

c/sinC = b/sinB

So, 99/(sin20) = b/(sin 148)

b = 99(sin 148)/(sin20)

b = 153.39m