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3 years ago

Please help!? I'm soooo confused? Please help as soon as possible. It's do soon! I would really appreciate it.

Mathematics

1 answer:

Nikitich [7]3 years ago

6 0

16 and 17. area is given. A= $\pi r^{2}$ use this relation to find radius

18.base=2, h=3.8 so, area=(1/2)*base*h=3.8 thats option D

19. area= base*h=12*7=84 option B

20.area of trapezoid= (1/2)h(a+b) where a and b are parallel sides.
so, area=(1/2)(3)(8.9+3.3)=(1/2)(3)(12.2)=3*6.1=18.3 option D

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From a radar station, the angle of elevation of an approaching airplane is 32.5 degree. The horizontal distance between the plan

denis23 [38]

Answer: 42.21 km

Step-by-step explanation:

We can solve this using trigonometry, since we have the following data:

$\theta=32.5\°$ is the the angle of elevation

$d=35.6 km$ is the horizontal distance between the plane and the radar station

$x$ is the hypotenuse of the right triangle formed between the radar station and the airplane

Now, the trigonometric function that will be used is <u>cosine</u>:

$cos\theta=\frac{d}{x}$ because $d$ is the adjacent side of the right triangle

$cos(32.5\°)=\frac{35.6 km}{x}$

Finding $x$ :

$x=\frac{35.6 km}{cos(32.5\°)}$

$x=42.21 km$

4 0

3 years ago

Please help with this!!! Im so confused, I will mark brainliest if right!! Explain

devlian [24]

Answer: Yes these triangles are similar

Step-by-step explanation:

First lets write down what we know just to make life easier

x=9

TL should be similar to CH

LY should be similar to KH

The angles should be equal due to SAS

So the first thing we know is true is the fact that they have equal angles. Now we have to find out if the sides are similar or if they change by the same ratio to the other. If TL is similar to CH and TL=25 and CH=10 what is the change in size or dilation. Division should do the trick so 25/10=2.5 so TY is greater than CH by a factor of 10. Which means that LY should also be greater than KH by a factor of 2.5. If we are told that x=9 than side LY or 4(9)-1=35 and KH 9+5=14

So side KH is 14 and LY is 35. Now to check if they are similar then KH should be greater by a factor of 2.5. If this is not true than the sides are not similar. 35/2.5=14

Since 35 divided by 2.5 is 14 we can tell both sides TL and LY are greater than KH and CH by a factor of 2.5

Hope this helps.

8 0

3 years ago

1. The value of y varies directly with x. If y = 30 when x =1/5

algol [13]

Answer:

4. b) 30

5. c) y=2/3x+9

6. y=2x-5

Step-by-step explanation:

6 0

3 years ago

(x+6)(x-2)(x-1)=60 write a polynomial

enot [183]

For this case what you should do is:
1) Multiplication of terms within parentheses correctly.
2) Rewrite the expression respecting power properties.
3) Add or subtract terms of equal power.
Note: See attached image.
Answer:
x ^ 3 + 3x ^ 2 -16x - 48 = 0

8 0

3 years ago

X + 5y = -2

love history [14]

Answer:

Hey bestfriends..lol

Ima say the answer is....?!?!?!? B

Step-by-step explanation:

5 0

3 years ago