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lions [1.4K]
3 years ago
13

What is the answer20+8r=-4r+5r

Mathematics
1 answer:
Naily [24]3 years ago
5 0

Answer:

The answer is r = -20/7

Step-by-step explanation:

20 + 8r = -4r + 5 r⇒ collect like term

20 + 8r = r⇒separate different terms in different  sides

20 = r - 8r

20 = -7r⇒divide both sides by -7

r = 20/-7

r = -20/7

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Which is the equation of a circle with its center at (-4,2) and a radius of 4?
Snowcat [4.5K]

Answer:

(x +4)^2 + (y-2)^2 = 16

Step-by-step explanation:

We can write the equation for a circle with the formula

(x-h)^2 + (y-k)^2 = r^2

Where (h,k) is the center and r is the radius

We know the center is at (-4,2) and the radius is 4

(x- -4)^2 + (y-2)^2 = 4^2

(x +4)^2 + (y-2)^2 = 16

4 0
3 years ago
Before we use an applet to simulate the selection of random samples from this population, let’s make sure we are clear about who
Sauron [17]

Answer:

D) college students

The college students are best describes the population

Step-by-step explanation:

<u>Explanation</u>:-

<u>Introduction</u>:-

The outcome of a statistical experiment may be recorded either as a numerical value or as a descriptive representation.

<u>Example</u>:-

  • when a pair of dice are tossed and the sum of the numbers on the faces is the outcome of interest, we record a numerical value.
  • If the students of a certain school are given blood tests and the type of blood is of interest, we record a numerical value.

In particular study, the number of possible observations may be <u>small, large but finite or infinite.</u>

<u> Example :- 1</u>

In the classification of blood types we can only have as many observations as there are students in the school.

Therefore the results are <u>finite number</u> of observations.

<u>Example :- 2</u>

If we could toss a pair of dice indefinitely and record the sums occur, we would obtain an infinite set of values .

<u>Population</u>:-

The total of observations which we are concerned , whether this number is finite or infinite , this is called the<u> population</u>

The number of observations in the population is defined to be the size of the population.

<u>Example</u> :- If there are 600 students in the school that we classified according to blood group, we say that the population of size is 600.

<u>Sample</u>:- A sample is subset of a population

Therefore in given data

The college students are best describes the population

Female college students , part -time college students , and female part-time college students are samples it will come from population

7 0
3 years ago
A person wishes to mix coffee worth nine dollars per pound with coffee worth three dollars per pound to get 240 pounds of a mixt
Anastasy [175]
\bf \begin{array}{lccclll}&#10;&amount&price&priced\ amount\\&#10;&-----&-----&--------\\&#10;\textit{9 bucks/lb}&x&9&9x\\&#10;\textit{3 bucks/lb}&y&3&3y\\&#10;-----&-----&-----&-------\\&#10;mixture&240&5&1200&#10;\end{array}&#10;\\\\\\&#10;\begin{cases}&#10;x+y=240\implies \boxed{y}=240-x\\&#10;9x+3y=1200\\&#10;----------\\&#10;9x+3\left( \boxed{240-x} \right)=1200&#10;\end{cases}

solve for "x".

what about "y"? well, y = 240 - x
4 0
3 years ago
the school band will sell pizzas to raise money for new uniforms the supplier charges $100 plus $4 per Pizza the band members se
VladimirAG [237]

100+4x =7x

100=3x

100/3 = 33.33

x = 33.33 round up to 34

they need to sell 34 pizzas to make a profit

6 0
3 years ago
It 5/2 not -5/2 and sorry for telling u the
babunello [35]
What does this mean buddy?
4 0
3 years ago
Read 2 more answers
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