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Kisachek [45]
3 years ago
12

Nick starts with 20 milligrams of a radioactive substance. The amount of the substance decreases by 12 each week for a number of

weeks, w. He writes the expression 20(12)w to find the amount of radioactive substance remaining after w weeks. Autumn starts with 1 milligram of a radioactive substance. The amount of the substance decreases by 50% each week for a number of weeks, w. She writes the expression (1−0.5)w to find the amount of radioactive substance remaining after w weeks. Use the drop-down menus to explain what each part of Nick's and Autumn's expressions mean.
Mathematics
1 answer:
Gre4nikov [31]3 years ago
6 0

Answer:

what the answer

Step-by-step explanation:

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Find the next three terms in each geometric sequence. -4, 16, -64, ...
givi [52]

Answer:

Step-by-step explanation:

Common ratio r = a₂/a₁ = 16/(-4) = -4

a₄ = a₃(-4) = 256

a₅ = a₄(-4) = -1024

a₆ = a₅(-4) = 4096

3 0
3 years ago
A woman bought a dress at a discount of 16 2/3. If the woman paid 32.50, what was the original price of the dress
kolbaska11 [484]
The original price = what the woman paid + <span>discount
                           = 32.50 + 16 2/3
                           = 32.50 +  50/3

convert to one form of fractions (improper or decimal)
                           = 49 1/6
                           = 49.16


--------------------------------------

In case of 16 2/3 % discount of the original price:

price after discount = price before discount - discount
                               = x - 16 2/3 % of x
                               = x -  01667x
</span><span>                               = 0.833 x</span>
<span><span>                       32.5 = 0.833 x

then x = 32.5/0.833 = 39.015 =~ 39


</span>hope that helps
</span>

3 0
3 years ago
Tom, Scott and dawn sold cookies at the school fair. Tom had 90 cookies and sold 60% of them. Scott had 150 cookies and sold 2/3
Nookie1986 [14]
----------------------------------------------------
Number of cookies Tom sold:
----------------------------------------------------
60% of 90 = 0.6 x 90 = 54

----------------------------------------------------
Number of cookies Scott sold:
----------------------------------------------------
2/3 of 150 = 100

----------------------------------------------------
Number of cookies Dawn sold:
----------------------------------------------------
46 (Given)

----------------------------------------------------
Total number of cookies sold:
----------------------------------------------------
54 + 100 + 46 = 200

----------------------------------------------------
Percentage of cookies sold by Dawn:
----------------------------------------------------
46/200 x 100 = 23%

----------------------------------------------------
Answer: Dawn sold 23% of the cookies that were sold.
----------------------------------------------------
7 0
3 years ago
User: A family spends 1/10 of its annual income for housing, 1/4 for food and clothing, 1/5 for general expenses, and 2/15 for e
Whitepunk [10]
\frac{1}{10}+\frac{1}{4}+\frac{1}{5}+\frac{2}{15}= \\ \\ \frac{1 \times 6}{10 \times 6}+\frac{1 \times 15}{4 \times 15}+\frac{1 \times 12}{5 \times 12}+\frac{2 \times 4}{15 \times 4}= \\ \\&#10;\frac{6}{10}+\frac{15}{60}+\frac{12}{60}+\frac{8}{60}= \\ \\ \frac{41}{60}

The answer is A.
4 0
4 years ago
Molly uses 192 beads to make a bracelet and a necklace. It takes 5 times as many beads to make a necklace than t does to make a
neonofarm [45]
Solve for the bracelet first. x represents number of beads for bracelet So it would be number of beads for the bracelet + number of beads for necklace (5x) and they both equal 192 x + 5x = 192 Then you would add the x and 5x.<br />6x = 192 Now all you have to do is divide by 6 on both sides. 6× ÷ 6 = 192 ÷ 6 You know have the number of beads it takes for a bracelet. x = 32 to get the necklace all you need to do is multiply it by 5 because you need 5 times more for the necklace. 32 × 5 total beads needed is 160. 160 x+5x=192 6×=192 6x÷6=192÷6 x=32 necklace needs 32x5 beads per necklace is 160
7 0
4 years ago
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