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Serhud [2]
3 years ago
13

Someone please helppppI'm stuck on this question

Mathematics
1 answer:
oksian1 [2.3K]3 years ago
8 0
I wish i could but i cant see it
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• a helicopter hovering at 10 m above the ground is shining a spotlight at a person 30 m away1 . if the person is 2 m tall how l
pshichka [43]

As shown in the figure

Height of helicopter above the ground=30 m

Distance from the base to the point where the person is standing=30 m

height of the person=2 m

Now the person cast the shadow of length x m.

Triangle ABC and triangle EDC are similar.

∵ ∠B= ∠D=90°

∠C is common.

So by AA similarity ΔABC and ΔEDC are similar.

As we know when triangles are similar their sides are proportional.

AB/AD =BC/DC

Let DC=x meter

⇒\frac{10}{x}=\frac{30+x}{x}

⇒5=\frac{30+x}{x}[/tex]

⇒5x=30+x

⇒4x = 30

⇒ x=30/4

⇒ x=7.5 meter

So length of shadow=7.5 meter

2. volume of a sphere of radius r is v (r) =\frac{4}{3}π r^{3}

\frac{\mathrm{d} }{\mathrm{d} r}V=4/3π×3r^2

       =4πr^2


surface area of a sphere of radius r is 4πr^2

b)  Ratio of derivative of volume of sphere to surface area of sphere=\frac{4\pi r^2}{4\pi r^2}

             =1  [ incomplete question but you have written few words ]

4 0
3 years ago
The perimeter of a rectangular swimming pool is 154m.Its length is 2m more than twice its breadth. What are the length and bread
TiliK225 [7]

P = 154\\a = 2b + 2

a = ?; b = ?

P = 2(a + b) = 2(2b + 2 + b) = 2(3b + 2) = 6b + 4

154 = 6b + 4\\6b = 154 - 4\\6b = 150\\b = 150 : 6\\b = 25

a = 2b + 2 = 2 * 25 + 2 = 50 + 2 = 52

Answer: 25 and 52 m.

3 0
3 years ago
Find the surface area of the following 3-d solid.
Masja [62]

Answer:

Surface area of cube =6× l^2 (where l is the side of cube)

Therefire 6×9^2=6×81

=486in^2

4 0
2 years ago
Help me please <br> math question
Diano4ka-milaya [45]

Answer: the answer would be D

Step-by-step explanation: in the exponent fraction the root would be 3 because the base of the fraction is thred. Always look at that.  

7 0
3 years ago
A linear equation in the form of y=mx+b
enot [183]

Answer:

im sorry

Step-by-step explanation:

i need points or else ill fail

4 0
3 years ago
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