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alina1380 [7]
3 years ago
8

When solving systems of equations with the elimination

Mathematics
1 answer:
viktelen [127]3 years ago
4 0

Step-by step explanation:

That's a great question. Look for things such as these:

x=x (infinite solution)

x=12 (one solution)

x+3 = x + 5 (no solutions)

https://youtu.be/bq5gDsEdN3Q this video has more information, copy and paste the link into your search engine.

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A class has fewer than 30 students exactly 2/3of the student's in the class own a football exactly 7/8 of the students in the cl
skelet666 [1.2K]
This number would be 24. So 21 own football boots, 16 own a football and there are 24 children in the class.  not good at math so yeah
5 0
3 years ago
What does control for eximerment mean<br><br> .
docker41 [41]

Answer:

The definition of a control experiment is a test where the person conducting the test only changes one variable at a time in order to isolate the results. An experiment where all subjects involved in the experiment are treated exactly the same except for one deviation is an example of a control experiment.

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
It takes 212121 minutes for 555 people to paint 777 walls. How many minutes does it take 333 people to paint 555 walls?
Papessa [141]

Solution: We are given that:

5 people can paint 7 walls in 21 minutes

Therefore, 1 person can paint 7 walls in 21 \times 5=105 minutes

Which means 1 person can paint 1 wall in \frac{105}{7} =15 minutes

Now, 3 people can paint 1 wall in \frac{15}{3} =5 minutes

Therefore, 3 people can paint 5 walls in 5 \times 5=25 minutes


3 0
3 years ago
find the number of terms in an AP given that its first and last terms are 13 and - 23 respectively and that its common differenc
Leokris [45]

Answer:

<u>There are 17 terms in the sequence</u>

Step-by-step explanation:

<u>Arithmetic Sequence </u>

An arithmetic sequence is a list of numbers with a definite pattern by which each term is calculated by adding or subtracting a constant number called common difference to the previous term. If n is the number of the term, then:

a_n=a_1+(n-1)r

Where an is the nth term, a1 is the first term, and r is the common difference.

In the problem at hand, we are given the first term a1=13, the last term an=-23, and the common difference r=-2 1/4. Let's solve the equation for n:

\displaystyle n=1+\frac{a_n-a_1}{r}

We need to express r as an improper or proper fraction:

\displaystyle r=-2\frac{1}{4}=-2-\frac{1}{4}=-\frac{9}{4}

Substituting:

\displaystyle n=1+\frac{-23-13}{-\frac{9}{4}}

\displaystyle n=1+\frac{-36}{-\frac{9}{4}}

\displaystyle n=1+36*\frac{4}{9}=17

n=17

There are 17 terms in the sequence

5 0
3 years ago
A bookshop sets the marked price of the book 25% higher than its cost, and then sold it at 10% discount
mestny [16]

Answer:

$405 - Can u plz give me the brainliest answer if possible? Plz!!!!!!!!!!!!!!

Step-by-step explanation:

360 x 0.25 = 90

360 + 90 = 450

450 x 0.1 = 45

450 - 45 = 405

Have a nice day!!!!!! :-)

<u>KA</u>

7 0
3 years ago
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