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2 years ago

Help me with this exercise

Mathematics

1 answer:

Svetradugi [14.3K]2 years ago

3 0

$\left(\frac{-3}4\right)^3 = \frac{-3}4 \times \frac{-3}4 \times \frac{-3}4 = \boxed{-\frac{27}{64}}$

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Xin Used 20 yards of fencing to build the walls of a square a chicken coop. Used 20 yards of fencing to build the walls of a squ

Gnoma [55]

Answer:

Equation: $20=4x$ or $x=\frac{20}{4}$

Solution: $x=5$

Step-by-step explanation:

The formula that is used to calculate the perimeter of a square is:

$P=4s$

Where "s" is the side lenght the square.

Knowing that Xin used 20 yards of fencing to build the walls of a square chicken coop (in which the lenght in yards of each wall is represented with "x"), you can identify that:

$P=20\\\\s=x$

Then, you can susbtitute values into the formula $P=4s$ :

$20=4x$

Finally, you must solve for "x" in order to find its value.

This is:

$\frac{20}{4}=x\\\\x=5$

6 0

3 years ago

What is the correlation coefficient with the following data points: (2,49), (45,2), (5,6)?

forsale [732]

Answer:

-0.62

Step-by-step explanation:

If you need, you can simply use a linear regression calculator! Most of them give the option to input points and calculate a equation for the line of best fit and a correlation coefficient.

Go to keisan . casio . com <--- Best example of linear regression calculator!

7 0

2 years ago

Question 11

mamaluj [8]

The first one is the correct answer

Y-7=-3(x+2)

6 0

2 years ago

Donald sells 760 marbles everyday. He sells each marble for 1.5 dollars. For how many days does Donald need to sell marbles to e

Harman [31]

Answer:

Donald needs 3 days to earn 3420 dollars

Step-by-step explanation:

Donald sells 760 marbles everyday. He sells each marble for 1.5 dollars

amount collected in one day= $760 \cdot 1.5=1140 dollars$

In one day the amount earned is 1140 dollars

we need to find the number of days needs to earn 3420 dollars

Number of days needed is $\frac{3420}{1140}=2.842$

So its around 3 days

Donald needs 3 days to earn 3420 dollars

8 0

2 years ago

Initially 100 milligrams of a radioactive substance was present. After 6 hours the mass had decreased by 2%. If the rate of deca

LenaWriter [7]

The amount of radioactive material remaining after 24 hours is 92.15 kg.

<h3>Exponential function</h3>

An exponential function is in the form:

y = abˣ

where y, x are variables, a is the initial value of y and b is the multiplier.

Let y represent the amount of the substance after t hours.

From the equation, a = 100 mg

Also, after 6 hours:

$100-100*2\%=100b^6\\\\98=100b^6\\\\b=0.9966$

After 24 hours:

y = 100(0.9966)²⁴ = 92.15 kg

The amount of radioactive material remaining after 24 hours is 92.15 kg.

Find out more on Exponential function at: brainly.com/question/12940982

4 0

2 years ago