3 years ago

3. Write 9 in scientific notation.

Mathematics

2 answers:

Wittaler [7]3 years ago

5 0

9 x 10º is the answer

shtirl [24]3 years ago

5 0

Answer:

9 x 10

Step-by-step explanation:

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John stands 150 meters from a water tower and sights the top at an angle of elevation of 36º. If John's eyes are 2 meters above

horsena [70]

Answer:

The height of tower $DB=111\ meters$ .

Step-by-step explanation:

Diagram of the given scenario is shown below.

Given that,

Distance between John and tower is $CE=150 \ meters$ .

Angle of elevation to the top of the tower is $\angle DEC=36$ °.

Height of John is $CB=2\ meters$ .

To Find: Height of the tower $DB$ .

So,

In triangle ΔDCE,

$Tan$ (∠ $DEC)= \frac{DC}{CE}$

$Tan (36)= \frac{DC}{150}$

$DC= tan(36)\times 150$

$DC=108.98\ meters$

Now,

To calculate the height of tower we have

$DB=DC+CB$

$DB=108.98+2$

$DB=110.98\ meters$ ≈ $111 \ meters$

Therefore,

The height of tower $DB=111\ meters$ .

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3 years ago

True or False: In an exponential regression, the data points tend to increase in one direction and flatten out in the other dire

kotegsom [21]

Answer:

Step-by-step explanation:

The regression line is flat when there is no ability to predict whatsoever. The regression line is sloped at an angle when there is a relationship. The extent to which the regression line is sloped, however, represents the degree to which we are able to predict the y scores with the x scores

8 0

3 years ago

Please help! (giving extra points)

SVETLANKA909090 [29]

The answer is 2 2/3
The work for it:

3 0

3 years ago

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Simplify 2.3w-7+8.1-3w

kotegsom [21]

Steps:

10.4w-7-3

10.4w-10

Answer:

10.4w-10

4 0

3 years ago

picture included , please help, which of the following equations describe the line shown below (1,10) and (-3,2) *check all that

rosijanka [135]

Slope is $\text{m}=\frac{y_1-y_2}{x_1-x_2}=\cfrac{10-2}{1-(-3)}$
Then you use the equation
$\text{y=mx+b}$
Where b is the y-intercept. To find it, plug in x and y from one of the points. Say, point 1 (1,10):
$10=m(1)+b$
You know m (from above) and now you can solve for b.

Rearrange terms:
$y-b=mx$

And that will be the answer.

Make sense?

4 0

4 years ago

Read 2 more answers