if i have a cylinder with a radius of 5, and a height of 8, what is its surface area.
p.s. i have already worked out the answer, but my teacher and i are having a debate on what the answer was. my answer was 408.41, and hers was 408.2. Which one is right?
+118667 this year, beavis is 4 times as old as Mavis, while in 5 years time, he will be 3 times as old as mavis. what are the current ages of beavis and mavis.
p.s. i already found the answer (beavis is 40, and Mavis is 10), but i am not really sure how to work it out and what steps to take. could you please write a solution for me.
B=4M (1)
B+5=3(M+5) (2)
Sub (1) into (2)
4M+5=3(M+5)
4M+5=3M+15
M=10 Marvis is 10
B=4*10=40 Beavis is 40
If you don't understand make sure you ask for more explaniation.
NEXT time is it better to put your new question up in a new post 
+14538
+26387 if i have a cylinder with a radius of 5, and a height of 8, what is its surface area. p.s. i have already worked out the answer, but my teacher and i are having a debate on what the answer was. my answer was 408.41, and hers was 408.2. Which one is right ?
$$\small{\text{$
\begin{array}{rcl}
\mathrm{radius~}r=5\\
\mathrm{height~}h=8 \\\\
\hline
\\
\mathrm{surface~area~} O&=&\pi r^2+ \pi r^2 + 2\pi r*h \\
O&=&2\pi r ( r + h ) \\
O&=&2\pi 5 ( 5 + 8 ) \\
O&=&2\pi 5 \cdot 13 \\
O&=&2\cdot 5 \cdot 13 \pi \\
O&=&130 \pi \\
\end{array}
$}}$$
If you set $$\small{\text{$\pi=3.14$}}$$ you get $$\small{\text{$
O=130\cdot 3.14 = 408.2
$}}$$
But if you set $$\small{\text{$\pi=3.14159265359$}}$$ you get the better answer $$\small{\text{$
O=130\cdot 3.14159265359 = 408.407044967
$}}$$
this year, beavis is 4 times as old as Mavis, while in 5 years time, he will be 3 times as old as mavis. what are the current ages of beavis and mavis.
p.s. i already found the answer (beavis is 40, and Mavis is 10), but i am not really sure how to work it out and what steps to take. could you please write a solution for me.
+118667 this year, beavis is 4 times as old as Mavis, while in 5 years time, he will be 3 times as old as mavis. what are the current ages of beavis and mavis.
p.s. i already found the answer (beavis is 40, and Mavis is 10), but i am not really sure how to work it out and what steps to take. could you please write a solution for me.
B=4M (1)
B+5=3(M+5) (2)
Sub (1) into (2)
4M+5=3(M+5)
4M+5=3M+15
M=10 Marvis is 10
B=4*10=40 Beavis is 40
If you don't understand make sure you ask for more explaniation.
NEXT time is it better to put your new question up in a new post
