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3 years ago

What is the surface area of this cylinder (round to the nearest tenth) 6.4 m2 25.1 m2 37.7 m2 62.8 m2

Mathematics

2 answers:

denpristay [2]3 years ago

8 0

Answer: 62.8m^2

Step-by-step explanation:

Surface area of a cylinder = $2\pi r^{2} + 2\pi rh$

r = 2m, h = 3m

$2\pi (2)^{2} + 2\pi (2)(3)$

= 62.83185

mariarad [96]3 years ago

6 0

Answer:

62.8m^2

Step-by-step explanation: 2\pi r^{2} + 2\pi rh

r = 2m, h = 3m

2\pi (2)^{2} + 2\pi (2)(3)

= 62.83185

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Find all complex solutions of the equation z⁴-1-i=0.

bulgar [2K]

Answer:

Step-by-step explanation:

hello :

z⁴=1+i given : z² = t t is the complex number so : z⁴= (z²)² =t²

solve for t this equation : t² = 1+i

if : t = x+iy t² =(x+iy)² = x²+2xiy+(iy)² =x²-y²+2xyi ...... ( i² = -1)

t² = 1+i means : x²-y²+2xyi = 1+i

you have this system : x²-y² = 1.....(*)

2xy = 1.....(**)

slve for x and y you ca add this equation : ....(***)

( use : t² = 1+i

/t²/ = /1+i/ so :/t/² = /1+i/ .... (√(x²+y²))²=√(1²+1²) =√2 means x²+y² = √2)

the system is : x²-y² = 1.....(*)

2xy = 1.....(**)

x²+y² = √2 ....(***)

add (*) and (***) : 2x²= 1+√2

x² = (√2+1)/2

substrac (*) and (***) you have : y² = (√2-1)/2

use (**) the proudect xy is positif (same sign) so :

x=√( (√2+1)/2) and y = √( (√2-1)/2) so : t1 =√( (√2+1)/2)+i√( (√2-1)/2)

x= -√( (√2+1)/2) and y = -√( (√2-1)/2) so :t2= -t1

same method for equation : z² =t1 ..(2 solution ) and z² = t2..(2 solution )

4 0

2 years ago

The RideEm Bicycles factory can produce 100 bicycles in a day at a total cost of $10,900, and it can produce 120 bicycles in a d

Minchanka [31]

Answer:

c(x) = 40 (x) + $6,900

Step-by-step explanation:

According to the scenario, given data are as follows,

Total cost of 100 bicycles (x1) = $10,900

Total cost of 120 bicycles (x2) = $11,700

Let Number of bicycles = X

Than cost of X bicycles = c(X)

let, fixed cost be F and variables cost be V, than

c(X) = V(X) + F

So, we can calculate variable cost by using following method,

V = c(x2) - c(x1) ÷ ( x2 - x1)

= ( $11,700 - $10,900) ÷ ( 120 - 100)

= $800 ÷ 20

= $40

So, calculate fixed cast by putting value to equation,

$10,900 = ($40 ×100) + F

F = $10,900 - $4,000 = $6,900

So, For x number of bicycles, cost equation will be,

c(x) = 40 (x) + $6,900

4 0

3 years ago

Find the measure of each angle indicated.

Ivanshal [37]

Answer:

3) B) 90°

4) A) 75°

Step-by-step explanation:

3) interior angles of a triangle =180°

40+50+?=180

? =180- 90

? =90

4) same rule

40+65+?=180

? =180 - 105

? = 75

8 0

2 years ago

What does the formula |_|r^2 <br> find?

Klio2033 [76]

It finds the Area of circle

7 0

2 years ago

The high for yesterday was 90°F, today the high is 78°F. What is the percent decrease in the

Sati [7]

Answer:

The temperature from yesterday to today decreased by 12 degrees fahrenheit.

Step-by-step explanation:

Ummm... it's true :)

6 0

2 years ago