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garri49 [273]
3 years ago
7

Thirty percent of a radioactive substance decays in four years.

Mathematics
1 answer:
wel3 years ago
8 0

Answer:

The substance decays by 7.5% every year

Step-by-step explanation:

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A circle is defined by the equation given below.
tatyana61 [14]

Answer:

(1/2, 1)

2

Step-by-step explanation:

x² + y² − x − 2y − 11/4 = 0

x² − x + y² − 2y = 11/4

Complete the squares.

x² − x + 1/4 + y² − 2y + 1 = 11/4 + 1/4 + 1

(x − 1/2)² + (y − 1)² = 4

The center of the circle is (1/2, 1) and the radius of the circle is 2.

5 0
3 years ago
I need to find the x pls help and show work
grigory [225]

Answer:

77

Step-by-step explanation:

84/12=7

so

7*11= 77

4 0
3 years ago
A marketing company surveys 100 males and 100 females between the ages of 55 and 70 to determine how many times they text each d
KiRa [710]

Answer:

Answer: I believe that A is the correct answer.

On average, females text more than males.

Step-by-step explanation:

3 0
3 years ago
What is the simplified form of (-3x3y2) (5xy-1)
arlik [135]
Simplify the expression
-15x4y3+3x3y2
Hope this helps! :)
~Zain
7 0
3 years ago
Evaluate this expression. 5^-3
sweet-ann [11.9K]

Answer:

\Huge \boxed{\frac{1}{125}}

Step-by-step explanation:

<h2>Order of operations</h2>

PEMDAS

Parenthesis, exponent, multiply, divide, add, and subtract from left to right.

Do exponent.

\displaystyle \frac{1}{5^3}

\displaystyle 5^3=5\times5\times5=125

\displaystyle \frac{1}{125}=125

\large \boxed{\frac{1}{125}}, which is our answer.

Hope this helps!

4 0
3 years ago
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