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Debora [2.8K]
3 years ago
5

Original price $279.99 markdown 75%​

Mathematics
1 answer:
sukhopar [10]3 years ago
3 0
$69.99 — I don’t know if it’s for sure but I tired hopefully it’s correct
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Plutonium-210 has a half-life of 140 days. Use the formula , where ,  is the remaining mass,  is the original mass, and is the h
a_sh-v [17]
Since this is exponential decay we can express it as:

f=ir^t, f=final amount, r=common ratio, t=time

If the half life is 140 days we can say:

a/2=ar^140

.5=r^140 

r=.5^(1/140)  now we can express our equation as:

f=i(.5^(1/140))^t which is equal to:

f=i(.5)^(t/140)  now we want to find the time necessary to reduce 300mg to 200mg so:

200=300(.5)^(t/140)  divide both sides by 300

2/3=.5^(t/140) taking the natural log of both sides

ln(2/3)=(t/140)ln.5  divide both sides by ln.5

ln(2/3)/ln.5=t/140  multiply both sides by 140

t=140ln(2/3)/ln.5

t≈81.89 days (to the nearest hundredth of a day)
6 0
4 years ago
Which is the solution to the equation below? 9=n+3
Lyrx [107]
9=n+3
Subtract 3 on each side

n=6
3 0
4 years ago
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6/10 divided by 2/5 from the triangle question
MArishka [77]

I believe the answer to this is 3/2

7 0
3 years ago
Rachel and David were shopping for holiday gifts when they noticed a Thanksgiving sweater on the discount rack. Rachel really wa
Leona [35]

Answer:

Sales\ Price = \$9.60

Step-by-step explanation:

Given

Price = \$24.00

Discount = 60\%

Required

Determine the sales price

First, we calculate the discount price

Discount\ Price = Price * Discount

Discount\ Price = \$24.00 * 60\%

Discount\ Price = \$14.4

The sales price is then calculated by subtracting the discount price from the original price of the item

Sales\ Price = Price - Discount\ Price

Sales\ Price = \$24.00 - \$14.40

Sales\ Price = \$9.60

8 0
3 years ago
20 points please help! <br><br> 7(14-x)=3x+18
Illusion [34]
98-7x=3x+18. -7x-3x=-98+18. -10x=-70. X=7.
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4 years ago
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