Answer:
3
Step-by-step explanation:
24 + (-1) = 23, 12 + (-2) = 10, 8 + (-3) = and 6 + (- 4) = 2, none of the sums are equal to 3, therefore b = 3 would give a prime quadratic. The correct answer is then A. 3
Answer:
![0.625kg](https://tex.z-dn.net/?f=0.625kg)
Step-by-step explanation:
we are given half-life of PO-210 and the initial mass
we want to figure out the remaining mass <u>after</u><u> </u><u>4</u><u>2</u><u>0</u><u> </u><u>days</u><u> </u>
in order to solve so we can consider the half-life formula given by
![\displaystyle f(t) = a {0.5}^{t/T}](https://tex.z-dn.net/?f=%20%5Cdisplaystyle%20f%28t%29%20%3D%20a%20%7B0.5%7D%5E%7Bt%2FT%7D%20)
where:
- f(t) is the remaining quantity of a substance after time t has elapsed.
- a is the initial quantity of this substance.
- T is the half-life
since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5
thus substitute:
![\displaystyle f(420)=5\cdot{0.5}^{420/140}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20f%28420%29%3D5%5Ccdot%7B0.5%7D%5E%7B420%2F140%7D)
reduce fraction:
![\displaystyle f(420)=5\cdot{0.5}^{3}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20f%28420%29%3D5%5Ccdot%7B0.5%7D%5E%7B3%7D)
By using calculator we acquire:
![\displaystyle f(420)=0.625](https://tex.z-dn.net/?f=%5Cdisplaystyle%20f%28420%29%3D0.625)
hence, the remaining sample after 420 days is 0.625 kg
31 miles an hour just divide 527 by 17
Answer:
Step-by-step explanation:
alphabet to represent numbers.
Answer:
d is the question
Step-by-step explanation: