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3 years ago

12

Someone pls help me, i will mark brainliest(no links)

1 answer:

chubhunter [2.5K]3 years ago

8 0

A and D are proportional

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two vertical cliffs are on opposite sides of a 90 foot wide river. From point A at the top of the shorter cliff, the angle of el

Sedbober [7]

Answer: The tall cliff is 118.20 feet tall and the short cliff is 70.32 feet tall.

If you draw a picture with 2 cliffs and a river in the middle, you have find 2 right triangles. In each triangle the adjacent side to our known angle is the river of 90 feet. And the unknown side is the opposite leg.

Therefore, we can set up a tangent equation.

From the top of the short cliff to the top of the tall cliff, we can right and solve the following trig equation:

tan(28) = x /90
x = 47.88

From the top of the short cliff to the bottom, we can right and solve the following trip equation.

tan(38) = x/90
x = 70.32

The 70.32 is also the height of the short cliff. And adding the two answers together will give you the height of the tall cliff.

5 0

4 years ago

303 is 93% of what?<br> Find the base

miskamm [114]

303 --> 93 %
x --> 100%

So $x= \frac{303*100}{93} = 325.8$

303 is 93% of 325.8.

Hope this helps !

Photon

5 0

4 years ago

Read 2 more answers

A random sample of 20 purchases showed the amounts in the table (in $). The mean is $49.57 and the standard deviation is $20.28.

son4ous [18]

Answer:

The 98% confidence interval for the mean purchases of all customers is ($37.40, $61.74).

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.98}{2} = 0.01$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.01 = 0.99$ , so $z = 2.325$

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 2.325*\frac{20.28}{\sqrt{20}} = 12.17$

The lower end of the interval is the mean subtracted by M. So it is 49.57 - 12.17 = $37.40.

The upper end of the interval is the mean added to M. So it is 49.57 + 12.17 = $61.74.

The 98% confidence interval for the mean purchases of all customers is ($37.40, $61.74).

3 0

4 years ago

ONE HUNDRED POINTS

Over [174]

Answer:

See Below.

Step-by-step explanation:

We are given that ∠A = ∠D, and we want to prove that ΔACB ~ ΔDCE.

Statements: Reasons:

$1) \text{ $\angle A=\angle D$}$ $\text{Given}$

$2) \text{ }\angle BCA=\angle ECD$ $\text{Vertical Angles Are Congruent}$

$3) \text{ } \Delta ACB \sim \Delta DCE$ $\text{AA (Angle-Angle) Similarity}$

5 0

3 years ago

Read 2 more answers

Is this right or wrong? Put these numbers in order from the smallest to the biggest. -1/5, -2/3, 2, 4.

quester [9]

Answer:no the -2/3 should be before -1/5

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers