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the graph of y = cos x and the line y = (-1)/2 over the interval [0,2 pi]. Where do the two graphs intersect? Give exact answers in radians,

$$\small{\text{$
\begin{array}{rcll}
\cos{(x)} &=& -\frac12 \\\\
\cos{(x)} &=& -\frac12 & \qquad | \qquad \pm\arccos{} \\\\
x_{1,2} &=& \pm \arccos{(-\frac12 )}\\\\
x_{1,2} &=& \pm 120 \ensurement{^{\circ}} \\\\
x_{1} &=& 120 \ensurement{^{\circ}} \\\\
x_1 &=& \frac{2}{3}\cdot \pi \\\\\\
x_2 &=& -120\ensurement{^{\circ}} + 360 \ensurement{^{\circ}} \\\\
x_2 &=& 240 \ensurement{^{\circ}} \\\\
x_2 &=& \frac{4}{3}\cdot \pi
\end{array}
$}}$$

can you explain me step by step how to solve this equations of 2 variables" x+y=170,x-y=20"

$$\small{\text{$
\begin{array}{lrclrclr}
(1) &\qquad x &+& y &=& 170\\
(2) &\qquad x &-& y &=& 20 \\
\hline
(1)+(2) & \qquad x+x &+&y-y &=& 170+20\\
& \qquad x+x &+&0 &=& 170+20\\
& \qquad 2x &+&0 &=& 170+20\\
& \qquad 2x &+&0 &=& 190\\
& \qquad 2x && &=& 190 &\qquad | \qquad :2\\
& \qquad \textcolor[rgb]{1,0,0}{x} &&&\textcolor[rgb]{1,0,0}{=}& \textcolor[rgb]{1,0,0}{95}\\
\hline
(1) &\qquad x &+& y &=& 170\\
&\qquad 95 &+& y &=& 170\\
&\qquad 95 &+& y &=& 170&\qquad | \qquad -95\\
&\qquad & & y &=& 170-95 \\
& \qquad && \textcolor[rgb]{1,0,0}{y} &\textcolor[rgb]{1,0,0}{=}& \textcolor[rgb]{1,0,0}{75}\\
\end{array}
$}}$$

x=4 because its to easy to solve, and thats the answer

bove is the graph of y = sin x and the line y = 1/2 over the interval [0,2 pi]. Where do the two graphs intersect? Give exact answers in rad

$$\small{\text{$
\begin{array}{rcl|rcl}
\sin{(x_1)} &=& \frac12 \qquad &
\qquad \sin{(x_1)} &=& \sin{ (180\ensurement{^{\circ}} -x_2) } =\frac12 \\
&&&\\
x_1 &=& \arcsin{( \frac12 )} \qquad &
\qquad \sin{ (180\ensurement{^{\circ}} - x_2) } &=&\frac12 \\
&&&\\
x_1 &=& 30\ensurement{^{\circ}} \qquad &
\qquad 180\ensurement{^{\circ}} - x_2 &=& \arcsin{( \frac12 )} \\
&&&\\
x_1 &=& \frac{\pi}{6} \qquad &
\qquad x_2 &=& 180\ensurement{^{\circ}}-\arcsin{( \frac12 )} \\
&&&\\
&&\qquad & x_2 &=& 180\ensurement{^{\circ}}-30\ensurement{^{\circ}}\\
&&&\\
&&\qquad & x_2 &=& 150\ensurement{^{\circ}}\\
&&&\\
&&\qquad & x_2 &=& \frac56 \cdot \pi\\
\end{array}
$}}$$

25% and 1/2?

sorry larry, but your wording made no sense

don't get too crazy, Larry!

anyways, mine is green

what kind of question is that, Larry?

everyone cares what X equals to in order to find the missing keys of life: numbers

without X and finding the missing numbers with algebra, i'd probably say this world would be a lot domber

also, X is cooler

how's that, Larry?

A letter that is found in the Greek alphabet. Also it's a mathematical term that is most commonly referred to as 3.14 or 22/7. Pi is used in equations to find the circumference and area of a circle as well as the volume of a cylinder, sphere, and cone. 

24 minutes

would you solve the same way for 2t=4over7

If you're smart, then it's 19.

If you stupid, then it's 21!

1/4x = 6

Multiply both sides by 4 to get rid of the 1/4 attached to the x

x = 24

Very funny.

An irrational number (it never ends.) 3.141529265359 and so on.

A pastry cup filled with meat and gravy with a pastry lid

So if you're look for 40% of 60 minutes, 60 is your 100%.

40%=.40 since 1=100 when percentages are writen as decimals.

It should be as simple as 60*.4 which =24, so 24 minutes is your answer.

Does that make sense?

yeah its english

84/100 or 42/50 or 21/25

34/100+5/10=

34/100+50/100=

84/100=

21/25.

No, it's a math website. Look at the name: Web 2.0 Calculator. Mindblown.

Oh yeah! Before I forget, mine is blue!