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erik [133]
3 years ago
9

I need help with 2-3

Mathematics
1 answer:
alekssr [168]3 years ago
6 0

Answer:

1

Step-by-step explanation:

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Answer number 10 please thank you
galina1969 [7]

Answer:

35%

Step-by-step explanation:

3 0
2 years ago
Meridith runs at a rate of 190 meters per minute. use the formula d= r times t to find how far she runs in 6 minutes.
Mariulka [41]
D= r×t
D= 190×6
D= 1140 meters
6 0
2 years ago
What is the total cost of a $150.00 necklace if the sales tax is 6.5%
LiRa [457]
The best thing to do is to find what 1% is, and you can do this by dividing 150 by 100.
150/100= 1.5
As you're looking for 6.5%, you've got to multiply 1.5 by 6.5
1.5*6.5= 9.75
You've then got to add 9.75 and 150 together
150+9.75= $159.75
Therefore, after the sales tax, the cost of the necklace is $159.75 
Hope this helps :) 
4 0
3 years ago
The half-life of lead is 22 years. How long will it take for a sample of this substance t decay to 80% of its original amount?
Svetlanka [38]

Answer: 7 years

Step-by-step explanation:

t_{\frac{1}{2} } = In2 / ∧

since the half life is given , we have :

22 = In 2/ ∧

∧ = In2/22

∧ = 0.032

Recall the formula for half life:

\frac{N(t)}{N(0)} = e^{-∧t}

Therefore:

0.80 = e^{-0.032t}

Take the In of both sides

In 0.80 = - 0.032t

t = In 0.80 / - 0.032

t = 7 years

4 0
3 years ago
−4x − 5y − z = 18<br> −2x − 5y − 2z = 12 <br> −2x + 5y + 2z = 4
MrRissso [65]

Answer: (x,y,z) = (-4,0,-2)

Step-by-step explanation:

6 0
3 years ago
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