Answer:
75%
Explanation:
In order to understand this question you need to understand the matching law first. The matching law provides the density of reinforcement or the rate of reinforcement if more than one response is available simultaneously to the individual. Here, two responses are available which are left key, 60 reinforcers per hour, and right key, 20 reinforcers per hour. This provides the ratio between the two reinforcers which is 60:20 or 3:1 in favor of left key. Here, one has to make a prediction only for left key and based on 3:1 ratio it can be said that 75% of pigeon will make their responses on the left key.
These are all tests for people who want to enter graduate degree programs.
His unknown secret weapon was disease.
When Cortez and his army invaded aztecs, a couple of his men were infected with smallpox.
Since the aztecs did not possess any immunity for it, the majority of their people were weakened by the disease, which make it easier for cortez army to conquer their region.
Answer:
to the nearest degree = 77°
Explanation:
This is a question under trigonometry
from the question we can find that The building is 210 feet tall and the length of its shadow is 50 feet.
The relationship between opposite and adjacent of the triangle is tan
Therefore tanθ = 
θ = tan⁻¹ 0.2380
= 13.39°
then we have to calculate the measure of the angle between the end of the shadow and the vertical side of the building , which is equal to
90 - 13.39=
=76.61°
to the nearest degree = 77°
