The depth of the water at the end of a pier changes periodically along with the movement of tides. On
a particular day, low tides occur at 12:00 am and 12:30 pm, with a depth of 2.5 m, while high tides
occur at 6:15 am and 6:45 pm, with a depth of 5.5 m. Let t = 0 be 12:00 am.
Graph the equation d = -1.5cos 474 +4 that models the situation using a graphing calculator and
use it to answer the following questions.
How many times during this day is the depth at
the end of the pier equal to 4 meters?
A.2 times
B.3 times
C. 4 times
D.5 times

The answer is c

Step-by-step explanation:

1. How many times during this day is the depth at the end of the pier equal to 4 meters?

2. At approximately what time on the next day does the depth first reach 4 meters?

Step-by-step explanation:

"it's not the heat, it's the humidity".   that's a partly valid phrase you may have heard in the summer, but it's actually both.   the heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.   this has important considerations for the human body's comfort.   when the body gets too hot, it begins to perspire or sweat to cool itself off.   if the perspiration is not able to evaporate, the body cannot regulate its temperature.   evaporation is a cooling process.   when perspiration is evaporated off the body, it effectively reduces the body's temperature.   when the atmospheric moisture content (i.e. relative humidity) is high, the rate of perspiration from the body decreases.   in other words, the human body feels warmer in humid conditions.   the opposite is true when the relative humidity decreases because the rate of perspiration increases.   the body actually feels cooler in arid conditions.   there is direct relationship between the air temperature and relative humidity and the heat index, meaning as the air temperature and relative humidity increase (decrease), the heat index increases (decreases).

step-by-step explanation:

y=x+9

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step-by-step explanation: