Find the polar coordinates in the usual way, then negate r and add 180° to θ.
You know that
... r = √(x² + y²)
... θ = arctan(y/x) . . . . . taking quadrant into account
The coordinates (r, θ) and (-r, θ+180°) specify the same point.
Answer:
The angle of elevation is approximately 
Step-by-step explanation:
Notice that the two pieces of information given: "400 ft away from a building", and building that is "850 ft tall", can be regarded as the two legs of a right angle triangle (see attached image).
Then the angle 
that we are trying to find (the angle of elevation) can be found by using the arc-tangent function:
Answer:
C. 23m, 20m, 13m
Step-by-step explanation:
Hope it help
Sorry if my answer is wrong
Answer:
Three times a number plus 16
To solve this, we simply need to break down the words and turn each part into an equation.
"Three times"
This shows that we will be multiplying 3 and something.
3*
"a number"
This shows that the number we will be multiplying 3 by is "n," which represents a number.
3*n or 3n
"plus 16"
This shows we will be adding 16 to the rest of the equation.
3n+16
Using the logic above, we can see that the equation to represent this is 3n+16.
Let after t hours the distances D1 traveled by car A
D1 = 30 t
Car B starts at 10 am and will therefore have spent one hour less than car A when it passes it.
After (t - 1) hours, distance D2 traveled by car B
D2 = 40 (t - 1)
When car B passes car A, they are at the same distance from the starting point and therefore<span> D1 = D2 </span>
30 t = 40 (t - 1)
Solve the equation for t,
30 t = 40t - 40
10 t = 40
t = 4
<span> Car B passes car A at = 9 + 4 = 1 pm.</span>
