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3 years ago

What are “like terms”? Why can we only add like terms?

Mathematics

1 answer:

SSSSS [86.1K]3 years ago

4 0

Answer:

Like terms are terms whose variables are the same.

We can only add them because if they does not have the same variable you do not actually know if the variables are equivalent and you will get the wrong answer.

Step-by-step explanation:

Ex: 4z,7z,108z,45z

Ex: 4w-2h+7a-2w

You can not add 4w and 7a because you do not know what the variables equal so you do not know the true number so add or subtract by.

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A beetle was running along a number line…

melamori03 [73]

Answer:

Its average speed is 7 units per second.

Step-by-step explanation:

25-4= 21

Distance is 21.

Divide the $\frac{distance}{time}$ , which will be $\frac{21}{3}$ . 21/3 is 7.

Its average speed is 7 units per second.

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3 years ago

Solve the inequality x^2-4x-7<0

ANEK [815]

Answer:

Inequality Form:

2 − √ 11 < x < 2 + √ 11

Interval Notation:

( 2 − √ 11 , 2 + √ 11 )

Step-by-step explanation:

Solve the inequality for x by finding a , b , and c of the quadratic then applying the quadratic formula.

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3 years ago

A survey showed that 30% of students bring their lunch to school. The survey polled 300 students. How many of the 300 students d

Karolina [17]

Let's first find how many students bring their lunch to school. This is 30% of 300. To find this value, convert the percentage to a fraction (or decimal) and multiply:

$30\% \,\, \textrm{of} \,\,300 = \dfrac{3}{10} \cdot 300 = \dfrac{900}{10} = 90$

Since 90 students bring their lunch to school, we can say 210 students do not bring their lunch to school. (300 - 90 = 210)

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3 years ago

your sister can get $30 per day for selling clothes at the market. but she has to $60 at first for renting a stand. you can get

ella [17]

Day Sis you
1 -30 20
2 0 40
3 30 60
4 60 80
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So day 6.

8 0

3 years ago

Read 2 more answers

A small publishing company is planning to publish a new book. The production costs will include one-time fixed costs (such as ed

zhuklara [117]

Answer:

For the cost from the two methods to be equal, 3,200 books have to be produced

Step-by-step explanation:

In this question, we are asked to calculate the number of books that will be produced for two methods of production having different fixed and variable costs to have the same production cost.

Since the number of books is something we do not know, let’s represent it with a variable called c.

For the first production method, the cost of production will be ; 58,881 + 8.50c

For the second production method, the cost of production will be; 18,081 + 21.25c

Now since they are said to be equal, we proceed to equate both;

58,881 + 8.5c = 18,081 + 21.25c

58,881-18,081 = 21.25c - 8.5c

40,800 = 12.75c

c = 40,800/12.75

c = 3,200 books

4 0

3 years ago