The half-life of a radioactive kind of lanthanum is 93 minutes. How much will be left after 279 minutes, if you start with 2,064 grams of it?
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Adele also must choose between leather or cloth seats for her vehicle. Leather seats come in three color choices; brown, black, and blue. Cloth seats come in two color choices; tan and gray. Using multiplication, Adele says she has (2)(3)(2), or a total of 12, choices for seat covers. Is she correct? Explain why or why not.
What is the common denominator for 1/5 2/3 5/8?
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5x – 2y + z = 0
2x – y + z = 3
3x + 4y = 18
Answers
Answer:
x= 2/5 y - 1/5 z
x= 3/2 + 1/2 y -1/2 z
x = 6 - 4/3 y
Step-by-step explanation:
5x – 2y + z = 0
5x=2y-z
* Moving variables to the right side and changing their signs
* divide both sides by 5
Answer: x= 2/5 y - 1/5 z
2x - y + z = 3
2x = 3 + y - 2
Answer: x= 3/2 + 1/2 y -1/2 z
* move variables to the right sides and change their signs
* divide both sides by 2
3x + 4 y = 18
3x/3 = 18 - 4/3
Answer: x = 6 - 4/3 y
* Move variables to the right side and change its sign
* divide both sides by 3
Answers
1.5*10^3/1=1.22*10^6/x
Cross multiply:
1.22*10^6=1.5*10^3x
Solve for x:
x=(1.22*10^6)/(1.5*10^3)
x≈813.33
Now, Divide 813.33 by 60 because the question asks for hours, not minutes:
813.33/60≈13.56
So it will take approximately 13.56 hours for them to finish filling up the swimming pool.
Answers
789.652
If the number is 4 or less, then we round down. If the number is 5 or more, then we round up.
Since '5' is 5 or more, we know to round up. So....
789.652 becomes 789.7
Answer=789.7
y=x-4
SHOW WORK PLEASE THIS IS FOR SOME BIG POINTS.....
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and y=x-4 be equation (2)
from (2)
y=x-4...(3)
sub (3) into (1)
x+(x-4)=10
x+x-4=10
2x=12
x=6
sub (x) into (3)
y=6-4
y=2
Answers
when x=2
-2(c+4)-3(2)
pemdas
-2c-8-3(2)
-2c-8-6
-2c-14
or
-2(c+7)
substitute x=2
-2(c+4)-3(2)
then distribute
-2c-8-3(2)
simplify
-2c-8-6
=-2c-14
-2(c+7)
Answers
To get it, we have to dividie 20min by 60 min (60 min=1hour), so
20:60=
We know that
where v is velocity, s is distance and t is time
We can modify formula to get
Now we just have to substitute our data ( t=1/3 and v=9 miles/hour)
s=