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3 years ago

What is the surface area of a cylinder with the given dimensions?

Mathematics

1 answer:

mafiozo [28]3 years ago

8 0

Step-by-step explanation:

7^2 × 3.14 × 2 + 3.14×14×672×3.14×2+3.14×14×6 = 49 × 6.28 + 3.14 × 8449×6.28+3.14×84 = 307.72+263.76307.72+263.76 = 571.48 cm^2c

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The weight of a nickel is 80% of a quarter. If a nickel weighs 5 grams how much does a quarter weigh?

muminat

Answer:

Weight of a quarter = 6.25 grams

Weight of a dime = 2.5 grams

Step-by-step explanation:

The weight of a nickel is 80%

The weight of a quarter or the weight of a nickel is 5 grams or weight of a quarter =50.8 = 6.25 grams

Weight of a dime = 50% = 12 (weight of nickel) = 52 = 2.5 grams

8 0

3 years ago

What is the equation of a line, in general form, that passes through point (1, -2) and has a slope of 1/3.

Studentka2010 [4]

Hello,

y+2=1/3*(x-1) ==>3y+6=x-1==>x-3y-7=0

Answer C

8 0

3 years ago

Read 2 more answers

What is the radius of the circle who’s equation is x^2 + y^2 = 9

Svetllana [295]

Answer:

r=3

Step-by-step explanation:

The equation of a circumference is $(x-a)^2+(y-b)^2=r^2$ .
Then , in this case $r^2=9$ , and then to know the value of r we just simply have to calculate the square root of 9, which is 3.

8 0

3 years ago

Find a linear second-order differential equation f(x, y, y', y'') = 0 for which y = c1x + c2x3 is a two-parameter family of solu

Alisiya [41]

Let $y=C_1x+C_2x^3=C_1y_1+C_2y_2$ . Then $y_1$ and $y_2$ are two fundamental, linearly independent solution that satisfy

$f(x,y_1,{y_1}',{y_1}'')=0$
$f(x,y_2,{y_2}',{y_2}'')=0$

Note that ${y_1}'=1$ , so that $x{y_1}'-y_1=0$ . Adding $y''$ doesn't change this, since ${y_1}''=0$ .

So if we suppose

$f(x,y,y',y'')=y''+xy'-y=0$

then substituting $y=y_2$ would give

$6x+x(3x^2)-x^3=6x+2x^3\neq0$

To make sure everything cancels out, multiply the second degree term by $-\dfrac{x^2}3$ , so that

$f(x,y,y',y'')=-\dfrac{x^2}3y''+xy'-y$

Then if $y=y_1+y_2$ , we get

$-\dfrac{x^2}3(0+6x)+x(1+3x^2)-(x+x^3)=-2x^3+x+3x^3-x-x^3=0$

as desired. So one possible ODE would be

$-\dfrac{x^2}3y''+xy'-y=0\iff x^2y''-3xy'+3y=0$

(See "Euler-Cauchy equation" for more info)

6 0

3 years ago

What is 10 more than 451

snow_lady [41]

<span>To find 10 more than 451 is very simple, simply add 10 to 451 to get 461.</span>

8 0

3 years ago