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Anna35 [415]
3 years ago
8

Anyone know the answer?

Mathematics
1 answer:
yan [13]3 years ago
7 0

Answer:

0.

Step-by-step explanation:

The angle whose sine is 5/12 = 22.62 degrees and in Quadrant II it is

180 - 22.62 degrees

The angle whose tan is (5/12)  = 22.62.

So we can write  α as 180 - α  and β as α.

sin (α+β) = sin ( 180 - α = α) = sin 180

= 0.

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Zach wants to build a slanted skateboard ramp. He knows he wants the ramp to form a 15 degrees angle with the ground and be 4 fe
frutty [35]

Answer:

54

Step-by-step explanation:

8 0
3 years ago
A water tower is formed by joining two hemispheres to a cylinder and removing the flat surfaces at the ends. The volume needs to
Mrac [35]
Wait what?
removing the flat surfaces...
... oh!
I get it

okey dokey
basicaly find the shape that gives you a volume of 200 cubic meters and and minimizes the amount of materials needed to make the conainer


find the volume
we can take the 2 hemispheres and combine them to get 1 sphere
we can take the cylinder as well
vsphere=(4/3)pir^3
vcylinder=hpir^2
so total volume would be (4/3)pir^3+hpir^2


now find surface area which is the amount of sheet metal we will need to construct it
surface area=lateral area of cylinder+surface area of sphere
lateral area of cylinder=2pirh
surface aea of sphere=4pir^2 
total surface area=2pirh+4pir^2
but, the hemishpere part costs 3 times more
so just say the cylinder part costs 1 dollar per square meter and hemisphere part costs 3 dollars so we mutiply hemishpere part by 3 to get
SAcost=2pirh+12pir^2



so we got
v=200=hpir^2+4/3pir^3
solve for h since the r exponents are tricky
h=\frac{200-\frac{4}{3} \pi r^3}{\pi r^2}
subsitute that for h in the other equation
SAcost=2pirh+12pir^2
SAcost=2 \pi r (\frac{200-\frac{4}{3}\pi r^3}{\pi r^2})+12 \pi r^2
now we simpilify and take the derivitive to find the value of r where SAcost is a minimum
we get at that the derivitive of SAcost is 0 at r=\sqrt[3]{\frac{150}{7 \pi}}
by subsituteion we find that the value of h will be then h=\frac{4(7 \pi -1)\sqrt[3]{7350}}{21\sqrt[3]{\pi}}

aproximately
the radius should be about 1.8964m and the height should be about 53.0789m
5 0
3 years ago
What is an equation of the line that passes through the points (-4,-2) and (-8,3) ??
andre [41]

Answer:

y =  − 5/ 4 x  − 7

Step-by-step explanation:

4 0
2 years ago
Can somebody actually help me?
Svetach [21]
The answer is letter B.
7 0
3 years ago
Read 2 more answers
Thanks to whoever decides to help :)
Ostrovityanka [42]

Answer:

(-4,5) if it is rotated 90 degree counterclockwise

3 0
3 years ago
Read 2 more answers
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