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Anna35 [415]
3 years ago
7

NEED HELP NOW...NEED CORRECT ANSWER...WILL MARK BRAINLIEST...

Mathematics
1 answer:
alexira [117]3 years ago
7 0
C. First person -hellobrains
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Twenty percent of a radioactive substance decays in ten years by what percent does the substance decay each year
kifflom [539]

Answer:

2%

Step-by-step explanation:

20% takes 10 years to decay

To find per year decay, we divide the percentage by the number of years, so we get unit rate of years {per year]. Thus we have:

20%/10 = 2% per year

It's that simple.

Hence, the percentage by which the substance decays each year is 2%

7 0
3 years ago
Read 2 more answers
I need the y values i guessed them but they are wrong<br> y=3x​
lara [203]
Y = 3x
x(3) = y

1) (-2) 3 = -6

2) (-1) 3 = -3

3) (0) 3 = 0

4) (1) 3 = 3


-6, -3, 0, and 3 respectively.

6 0
3 years ago
Helpppppp please due today ​
juin [17]

Answer:

Y=-2x+5 (3 or C)

Step-by-step explanation:

Replace the value of x

Y= -2x(-1)+5

Solve

Y= 2+5

Y= 7

5 0
3 years ago
Solve for y. -15y – -14y = -9
Black_prince [1.1K]

Answer:

9

Step-by-step explanation:

-15 - -14y = -9

two negatives (close together) makes a positive

-15y + 14y = -9

add like terms

-1y = -9

get y alone (divide whats in front of it) and do the same on the other side

-1y/-1 = -9/-1

if you divide two negatives it makes it positive so youll get 9

4 0
3 years ago
A polygon has an area of 225 square meters. If the area is tripled, how does each side length change?
krok68 [10]
Let me tell you the process so that you get to the answer
Remember first that the area of a regular polygon with x sides has  each of them a length which can be represented by y 

<span>A = 1/4 * xy^2 * Cot(180/x) </span>
<span>The purpose is to solve for y, so we get </span>
<span>y^2 = 4A/(xCot(180/x)) </span>
<span>y = √(4A/(xCot(180/x)))

The thing we need to change is A in the previous formula and with that we can use the equaation to be a constant. This could be represented by Z
</span><span>Z = √(4/(xCot(180/x)))
so
</span><span>Y = Z√A 
</span><span>If we increase area by a factor s, y increases by a factor of √x.
</span>So if you want to know the triple then you need to increase it by <span> √3 </span> <span>  </span>
3 0
3 years ago
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