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Hi. I was working through the UIL Districts 2 test and came across some problems that I was unable to do. Any advice and explanation would be greatly appreciated.
49) Cy Phy's physics class is trying to determine the magnitude of the sum if two forces, 220 and 180 lb, act on an object at an angle of 46 degrees. What is the magnitude of their sum? (nearest lb).

And number 52, for wish you would require a picture that I am unable to reproduce here. The link to that test is: http://texasmath.org/DL/UIL2010D2.pdf

There is another one that I needed help on.
44) {(x,y)|x,y<-{Integers}, -10<=x<=10 and -5<=y<=5} is the solution set of 3x-5y=7.
How many such ordered pairs exist?

Is there a way to do this without going through every single x and checking to see if it is divisble by 5 when put in the equation 3x-7 and checking to see if the result is less than 5 or greater than -5?

and for #52:
if u set the point of intersectiong be point G, and so, as u can see, [unparseable or potentially dangerous latex formula] and [unparseable or potentially dangerous latex formula] and since [unparseable or potentially dangerous latex formula], so [unparseable or potentially dangerous latex formula], and in the end, times 2 to get EF.

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