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3 years ago

21 is 84 percent of what number

1 answer:

5 0

Let the required no. be x then according to question
(84/100)*x = 21
x = 21*(100/84)
x = 2100/84
x = 25

hence the required no. is 25

hope it helped

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Find the area of the shape shown below.

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PLS HELP ASAP The following probability distribution table shows information collected from a survey of students regarding their

gregori [183]

Answer:

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For these types of problems, look at the totals. We know that there are 0.44 out of 1 eighth graders. Since it doesn't specify how the 8th grader is dropped off, we take 0.44 and divide it by 1 (the total). We get 0.44, but since it's most likely asking for percentages, multiply that by 100.

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2 years ago

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2 years ago

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valentinak56 [21]

7.85 is the approximate answer. (If pi is 3.14)

Steps are on paper.

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3 years ago

A port and a radar station are 3 mi apart on a straight shore running east and west. A ship leaves the port at noon traveling at

Brums [2.3K]

Answer:

The answer is $34.37 deg/h$ .

Step-by-step explanation:

Use the image provided here for clarification purposes. It helps so much to make a drawing in this sort of questions. The tracking angle here is drawn as $\theta$ .

<em>Law of sines </em>is applied to the vertical side (ship's trayectory) and the horizontal side (shore line). Here, time must be expressed in hours:

$\frac{sin \theta}{18t}=\frac{sin(\pi /2 - \theta)}{3}=\frac{cos\theta}{3}$

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$\theta=arctan(6t)$ .

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$\frac{d \theta}{dt}=6\frac{1}{1+(6t)^2}$ .

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$\frac{d \theta}{dt}(t=1/2)=6\frac{1}{1+(3)^2}=6/10=0.6$ rads/h.

Please note this is the actual rate of change of the tracking angle at this very moment, but not for the rest of moments. It is a function, variable with time, applied to a specific instant. For a value in degrees,

$0.6\frac{180deg}{\pi}=34.37 deg/h$

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2 years ago