Answer:
(-4, 5.5)
Step-by-step explanation:
1. put your Xs and Ys over 2
2. add them together
3. Divide
4. Simplify
5. Turn fraction into decimal
It's for sure reflection symmetry, I think it's also point reflection (the point must be in the very middle of the figure). I hope it will help you somehow :)
Answer:
Step-by-step explanation: C
The measurement for the third side is 155 cm. Hope this helps! Mark my answer brainliest when u can please thx
The half-life of Po is 139 days, so its decay rate is
0.5 = e^(139k) ==> k = ln(0.5)/139
After some time t, 80% of the material will have decayed and you'll be left with a sample 20% of its original mass:
0.2 = e^(kt) ==> t = ln(0.2)/k = ln(0.2)/ln(0.5) * 139 = 322.748
so your sample is usable for about 323 days.
