NinjaDevo

That's great...but what's the question? :)

I'm thinking your probably want to find the height of the rectangle.

Here, we need to break this apart into a right triangle and solve and using the Pythagorean Theorem. Here we want to find the height (or a)

Ah I see, I as getting caught up of the "bearing" part.

I thought it meant distance to the starting point, but it really meant the angle.

Well, if he is only selling snacks to raise money for the trip, 210 ÷ 18 will tell is how much David much sell each snack bag for for him to meet his goal.

210 ÷ 18 = 11.66666666666666

Rounded up, we get 

$11.67

That's how much he has to sell each bag of snacks for. He will have a few cents left over, but that's only because we have a repeating decimal.

Hate to correct you CPhill, but I think this may be:

(1.2 x 10 ^-16) / (9.11 x 10^31) =

(1.2 / 9.11) x (10^-47) ≈

.1317 x 10^-47 ≈

1.317 x 10^-48 (in scientific notation)

because 10^-16 / 10^31 = 10^(-16 - 31) = 10^-47

I have a slightly different way, but it's basically saying the same thing.

$$\begin{array}{l}
435\;is\;15\;percent\;of\;what\;number\\
435=15\;percent\;of\;N\\
435=15\%\;of\;N\\
435=15\%\times N\\
435=0.15\times N\qquad\qquad\mbox{Divide both sides by 0.15}\\
2900=N
\end{array}$$

$$6+7=13\\
\mbox{But you already knew that
....i hope}$$

I just solved this by trial-and-error.

I'm sure there's a formula to this, but here's my reasoning:

If it is not divisiable by 2, 3, 4 ,5 ,6 ,or 10, it really has to be divisiable by 7, because 7 is a prime number.

So I tried 777, but that is divisiable by 3. 

Next I tried 707, and when divided by 2, 3 ,4 ,5 ,6, and 10 it did not come out as a whole number.

So I got 707. Hope this helps.