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3 years ago

Need help with sisters homework please explain steps and how to get the answer please

Mathematics

1 answer:

malfutka [58]3 years ago

4 0

Answer: 1.8 kg

Step-by-step explanation: Because 55-3 ½ is 52 so you need to do to 53.8 minus what equals 52, which is 1.8.

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The average weight of a 7-year old girl is 49 pounds. The average weight of an 11 year old girl is 77 pounds.

Aneli [31]

I only know D. but I'll try to figure out the rest too. D. 9 years old

8 0

3 years ago

1) For a period of time, an island's population grows at a rate of 3.8% per year. If the current

LenaWriter [7]

Okay so 3.8% of 1,543 is 58.634 so then you would multiply it by 5.2 for years witch would be 304.8978 so add that to the original witch is 1543 so your answer would be 1847.8978 rounded up would be 1848

7 0

2 years ago

1. A plane is flying at an altitude of 13000 feet. The angle of depression from the plane to a control tower is 20 degrees. The

Mariulka [41]

Answer:

see explanation

Step-by-step explanation:

There is a right triangle formed between the height above the tower to the plane, the horizontal and the line from the tower to the plane.

The height above the tower to the plane = 13000 - 150 = 12850 ft

The angle between the plane and the tower is 20° , angle of depression.

Using the tangent ratio in the right triangle formed, with the adjacent side being the horizontal ( hor ) distance, then

tan20° = $\frac{opposite}{adjacent}$ = $\frac{12850}{hor}$ ( multiply both sides by hor)

hor × tan20° = 12850 ( divide both sides by tan20° )

hor = $\frac{12850}{tan20}$ ≈ 35305 ft ( to the nearest foot )

(2)

Arianna is 60 + 5 = 65 ft above the ground ( to her eye level )

Using the right triangle formed with legs 65 and 37 and angle of depression x, then

tanx° = $\frac{opposite}{adjacent}$ = $\frac{37}{65}$ , thus

x = $tan^{-1}$ ( $\frac{37}{65}$ ) ≈ 30° ( to the nearest degree )

4 0

3 years ago

Read 2 more answers

!!!! PLEASEEE HELP ME, IDK WHAT TO DO PLEASE !!!!

Helga [31]

Answer:

The first question is A.

The second question is C.

The thid question is B., I think i'm not quit sure sorry

4 0

2 years ago

Find the exact value of tan 15 degrees

pentagon [3]

<span>tan(15) =
sin(15) / cos(15) =
sin(45 - 30) / cos(45 - 30) =
[ sin(45)cos(30) - sin(30)cos(45) ] / [ cos(45)cos(30) + sin(45)sin(30)]

Since sin(45) = cos(45) = √2/2, you can just factor that out from the top and bottom
[ cos(30) - sin(30) ] / [ cos(30) + sin(30)]
[ √3/2 - 1/2 ] / [ √3/2 + 1/2]
(√3 - 1) / (√3 + 1)
(√3 - 1)^2 / (√3+1)(√3 - 1)
(√3 - 1)^2 / (3 - 1)
(3 - 2√3 +1) / 2
2 - √3

There's also a formula for tan(a-b), but I couldn't remember it off hand.</span>

4 0

2 years ago