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slavikrds [6]
3 years ago
12

Need help on this one thank u

Mathematics
2 answers:
PilotLPTM [1.2K]3 years ago
6 0

Answer:

A

Step-by-step explanation:

a + 0.5b - 4 a - b \\  - 3a -  \frac{1}{2} b

Mkey [24]3 years ago
4 0

Answer:

c

Step-by-step explanation:

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The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years?
adell [148]

Answer: 129.33 g

Step-by-step explanation:

$$Let $p=A \cdot e^{n t}$ \\$(p=$ present amount, $A=$ initial amount, $n=$ decay rate, $t=$ time)

\begin{aligned}&\Rightarrow \text { Given } p=\frac{A}{2} \ a t  \ t=1590 \\&\Rightarrow \frac{1}{2}=e^{1590n} \Rightarrow n=\frac{\ln (1 / 2)}{1590}=-0.00043594162\end{aligned}

$$If $A=200 \mathrm{mg}$ and $t=1000$ then,$$\begin{aligned}P &=200 e^{\left(\frac{\ln \left(1/2\right)}{1590}\right) \cdot 1000} \text \\\\&=129.33 \text { grams}\end{aligned}$$

3 0
2 years ago
PLEASE HELPPP!!!!!! Write an equation of the line passing through point P that is perpendicular to the given line.
ArbitrLikvidat [17]

Answer:(d): y=ax+b (a≠0); (d1)y=-4x+13

because of (d)⊥(d1) --> a.(-4)=-1 --> a=\frac{1}{4}

(d): y=\frac{1}{4}x+b. (d) pass through  P(-1;-2) so we have

-2=(1/4).(-1)+b ---> b=\frac{-7}{4}

(d) y= \frac{1}{4}x+ \frac{-7}{4}

4 0
3 years ago
Which exponential equation is equation is equivalent to the logarithmic equation below? Log 200 = a
weqwewe [10]

Answer:

Which exponential equation is equation is equivalent to the logarithmic equation below? Log 200 = a

A) 200^10=a  

B)a^10=200  

C)200^a=10  

D)a0^a=200

D) 10^a = 200 is the answer

Hope This Helps!     Have A Nice Day!!

4 0
3 years ago
Read 2 more answers
Sarah's mom takes the parkway to work it takes her 30 minutes to travel from mile marker 88th where she answers to her exit at m
pentagon [3]
121- 88 = 33 miles traversed in 30 minutes.
 
d = r*t
33 = r* (.5 hr)

Solve for r. Average speed will be in miles per hour. <span>
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.
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3 years ago
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Lisa [10]

Answer:

Step-by-step explanation:

8 0
3 years ago
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