Answer:
Since in your question you don't specify the coordinates of any of them, the best answer would be (-x, y) since that is the formula to find the reflection over the y-axis.
Answer: The first one does not belong, neither does the third.
Step-by-step explanation:
The second one belongs as 30+5=35. You can divide 35 by 5 to get A=7. This is a valid answer. The third is the same as the first. The fourth acts for 30+25=5. 55/5=11.A=11. This is also a valid answer. So, the first one does not belong and neither does the third.
Step-by-step explanation:
The problem statement says λ<1. If this is true, then the cannonball is slower than the boat, and it will never reach the boat. So I assume it's actually λ>1.
If we say t is the amount of time, then the boat travels south a distance of ut, and the cannonball travels a distance of λut.
v = λut
ut = v/λ
Using Pythagorean theorem:
d² + (ut)² > v²
d² + (v/λ)² > v²
λ²d² + v² > λ²v²
λ²d² > (λ² − 1) v²
λ² / (λ² − 1) > (v/d)²