Caution
I just finished doing this exact same problem. In nearly 4000 answers, I don't think that's ever happened. It's a great problem. Study it carefully but make sure you handle with care. Most area questions don't work this way.
Remark:
This problem will puzzle you greatly until you look at the diagram carefully.
Draw the diagram so that AC is on the horizontal and make it the longest line. This problem does not require that you have an accurate diagram.
Eyeball P so that it looks like it divides AC in such a way that PC is 2 units and AP is about 3 units. From B draw a line that is Perpendicular to AC. It shouldn't meet P otherwise you will get confused. Where the line from B hits AC label that point D. BD is perpendicular to AC.
What you need to know
BD is the height of both triangles. What does that mean? In practical terms it means that you can call the ratio of the areas 3/2
Ratio
Triangle ABP: Triangle BPC = x/14
3:2 = x:14 Change to a proportion
3/2 = x/14 Cross multiply
3*14 = 2x Combine
42 = 2x Divide by 2
42/2 = x Divide
21 = x
Conclusion One
The area of ABP = 21 square units.
Conclusion Two
Area ABC = Area ABP + Area CBP
Area ABC = 21 + 14 = 35
Nice problem. Be careful how you treat it. Usually these kind of ratio problems don't work this way.
![\bf so \begin{cases} A=\textit{area of first desert}\\ B=\textit{area of second desert}\\ --------------\\ \textit{whatever long B is, A is 6 times that much} \\\\ A=\boxed{6B}\\ --------------\\ \textit{now, their sum is }1,400,000\textit{ that is} \\\\ A+B=1,400,000\implies \boxed{6B}+B=1,400,000 \end{cases}](https://tex.z-dn.net/?f=%5Cbf%20so%20%5Cbegin%7Bcases%7D%0AA%3D%5Ctextit%7Barea%20of%20first%20desert%7D%5C%5C%0AB%3D%5Ctextit%7Barea%20of%20second%20desert%7D%5C%5C%0A--------------%5C%5C%0A%5Ctextit%7Bwhatever%20long%20B%20is%2C%20A%20is%206%20times%20that%20much%7D%0A%5C%5C%5C%5C%0AA%3D%5Cboxed%7B6B%7D%5C%5C%0A--------------%5C%5C%0A%5Ctextit%7Bnow%2C%20their%20sum%20is%20%7D1%2C400%2C000%5Ctextit%7B%20that%20is%7D%0A%5C%5C%5C%5C%0AA%2BB%3D1%2C400%2C000%5Cimplies%20%5Cboxed%7B6B%7D%2BB%3D1%2C400%2C000%0A%5Cend%7Bcases%7D)
solve for "B" to see how long is the B desert,
now, what about desert A? or the first desert? well, is 6B :)
Answer:
4th option
Step-by-step explanation:
There is a negative exponent so you have to move it to the bottom :
Then you apply to power rule :5^(3*2) = 5^6 and it will be positive because you already got rid of the negative by bringing the value down down.
By Green's theorem,
![\displaystyle\int_C\cos y\,\mathrm dx+x^2\sin y\,\mathrm dy=\iint_D\left(\frac{\partial(x^2\sin y)}{\partial x}-\frac{\partial(\cos y)}{\partial y}\right)\,\mathrm dx\,\mathrm dy](https://tex.z-dn.net/?f=%5Cdisplaystyle%5Cint_C%5Ccos%20y%5C%2C%5Cmathrm%20dx%2Bx%5E2%5Csin%20y%5C%2C%5Cmathrm%20dy%3D%5Ciint_D%5Cleft%28%5Cfrac%7B%5Cpartial%28x%5E2%5Csin%20y%29%7D%7B%5Cpartial%20x%7D-%5Cfrac%7B%5Cpartial%28%5Ccos%20y%29%7D%7B%5Cpartial%20y%7D%5Cright%29%5C%2C%5Cmathrm%20dx%5C%2C%5Cmathrm%20dy)
where
is the region with boundary
, so we have
![\displaystyle\iint_D(2x+1)\sin y\,\mathrm dx\,\mathrm dy=\int_0^5\int_0^4(2x+1)\sin y\,\mathrm dy\,\mathrm dx=\boxed{60\sin^22}](https://tex.z-dn.net/?f=%5Cdisplaystyle%5Ciint_D%282x%2B1%29%5Csin%20y%5C%2C%5Cmathrm%20dx%5C%2C%5Cmathrm%20dy%3D%5Cint_0%5E5%5Cint_0%5E4%282x%2B1%29%5Csin%20y%5C%2C%5Cmathrm%20dy%5C%2C%5Cmathrm%20dx%3D%5Cboxed%7B60%5Csin%5E22%7D)