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3 years ago

Find the surface area of this cylinder round to the nearest tenth

Mathematics

1 answer:

lozanna [386]3 years ago

6 0

Step-by-step explanation:

The surface area of a cylinder is given by

$A = 2\pi r^2 + 2\pi rL$

$\:\:\:\:=2\pi(3\:\text{cm})^2 + 2\pi(3\:\text{cm})(12\:\text{cm})$

$\:\:\:\:= 282.7\:\text{cm}^2$

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Please help me, I don't know what to do

Anna71 [15]

$|-6|+3|4|+|-5|-0\cdot6=\\
6+3\cdot4+5-0=\\
11+12=\\
23$

$R=x(A+B)\\
R=Ax+Bx\\
Bx=R-Ax\\
B=\frac{R-Ax}{x}$

$A=\frac{12.6\cdot42}{2}\\
A=12.6\cdot21\\
A=264,6
$

3 0

3 years ago

A piece of cardboard measuring 9 inches by 11 inches is formed into an open-top box by cutting squares with side length x from e

Alika [10]

Answer: $\left ( 11-2x\right )\times \left ( 9-2x\right )\times \left ( x\right )$

Step-by-step explanation:

Given data

breadth=9 in

Length=11 in

Now a square of side x is cutted for each corner such that the cardboard is made into a open-top box with

length=11-2x

breadth=9-2x

height=x

Here substract 2x because from both sides of length and breadth x units are reduced.

therefore volume of new open-top box is

Volume(v)= $\left ( 11-2x\right )\times \left ( 9-2x\right )\times \left ( x\right )$

5 0

3 years ago

Simplify the expression 2.75j + 2.25 - 1.5j + 3

Katarina [22]

1.25j+5.25 would be the answer. just combine like terms

3 0

3 years ago

there arre 221 students on a fiel trip five students ride in a van the rest of the students fill the 6 buses enter an equation t

iren2701 [21]

According to the question statement, the total sum of students is 221, which includes the students that ride on bus and the students that ride in a van.

The students that ride in a van are five, the students that ride on bus are 6 times s which is the product of the number of buses and the number of students that are on each bus.

Write all this information into an equation, this way:

$6s+5=221$

Now, solve the equation for s to find the number of students that are on each bus.

$\begin{gathered} 6s+5=221 \\ 6s=216 \\ s=\frac{216}{6} \\ s=36 \end{gathered}$

There are 36 students on each bus.

3 0

2 years ago

If m varies directly as v² and m =3, when v=2, calculate the value of m when v=9

KonstantinChe [14]

Answer:

m=243/4 when v=9.

Step-by-step explanation:

We know that when y varies directly with x², the formula of direct proportion is

y=kx²

where 'k' is the constant of variation.

As m varies directly with v², and m=3 when v=2

m=kv²

k=m/v²

= 3/(2)²

=3/4

Hence, k=3/4

so when v=9 then the expression becomes

m=kv²

substituting v=9 and k=3/4

m= 3/4(9)²

=3/4 × 81

=243/4

Therefore, m=243/4 when v=9.

5 0

3 years ago