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ollegr [7]
3 years ago
15

1. There are 26 letters in the alphabet. If A = 1 and Z = 26, what is the sum of B and Y?

Mathematics
2 answers:
N76 [4]3 years ago
5 0

1. 27 (2+25)

2. 10 (3+7)

3. 29 (13+16)

4. 30.48 (12x2.54)

Pls mark branliest if this helped.

Grace [21]3 years ago
3 0

Oh yeah he’s right. Just scroll up from my answer to see the correct answer.

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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
Last one can anyone help me plz​
meriva

Answer:

  • (f - g)(x) = -x² + 2x +1

Step-by-step explanation:

Given

  • f(x) = 2x
  • g(x) = x² - 1
  • (f - g)(x) = ?

Solution

  • (f - g)(x) = 2x - (x² - 1) = 2x - x² + 1 = -x² + 2x +1
  • (f - g)(x) = -x² + 2x +1
5 0
3 years ago
Un pediatra obtuvo la siguiente tabla sobre los meses de edad de 50 niños de su consulta en el momento de caminar por primera ve
aksik [14]
Idk what the answer is I need help too

7 0
3 years ago
The telephone company charges $1.35 fir the first 3 minutes of a phone call and $0.35 for each additional minute. i talk on the
irinina [24]

Answer:

$5.20

Step-by-step explanation:

Talked on the phone for 14 minutes .

14 - 3 = 11

11 x .35 = 3.85

3.85 + 1.35 = 5.2

8 0
3 years ago
I need this done:'( please
NISA [10]
Hey! When you ask a question there is a math equation option. Use that to scan the problem and it will give you your answer.
3 0
3 years ago
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