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mr Goodwill [35]
3 years ago
15

Simplify the expression. 7(x - 1) - 2(x + 1) + 3( x - 4) =

Mathematics
2 answers:
lawyer [7]3 years ago
8 0
7x-7-2x-2+3x-12=8x-21
  I think
KonstantinChe [14]3 years ago
3 0
8x-21 is the correct answer
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~~~15 POINTS~~~<br> Please help me with this question.
Step2247 [10]
Divide the actual building's measurements by the replica's measurements.

\frac{400}{20}=20\\\\\frac{320}{16}=20

The measurements of the actual building are divided by 20 not 12.
The crew member's calculation is incorrect.
7 0
3 years ago
Simplify each expression by combining like terms. <br>7a - 6 + 8a ​
anygoal [31]

=7a - 6 + 8

=7a + 8a - 6 =15a - 6

5 0
3 years ago
Sajia has 30 Books in her library. she sold 9 books at the thrift store on Saturday. Write and solve and inequality to determine
ELEN [110]

Sajia can sell 21 books she can sell if she comes back on sunday and the required inequality is 9 + x \leq 30

<em><u>Solution:</u></em>

Given that Sajia has 30 Books in her library

She sold 9 books at the thrift store on Saturday

To find: We have to write and solve an inequality to determine number of more books she can sell if she comes back on sunday

Let "x" be the number of more books she can sell if she comes back on sunday

<em><u>We can write a inequality as:</u></em>

\text{ books already sold } + \text{ number of books remaining } \leq \text{ total number of books she has }

9 + x \leq 30

Now moving 9 from L.H.S to R.H.S we get,

x \leq 30 - 9

On solving 30 - 9 = 21,

x \leq 21

So Sajia can sell 21 books she can sell if she comes back on sunday

6 0
3 years ago
Pls helpppp!!<br> Its a math question i suck at math please help!
Mrac [35]
I believe it is the first one
8 0
2 years ago
9 is the difference between two numbers, and their sum is 31. Find the numbers.
algol [13]

Answer:

The first number is 20, the second one is 11

Step-by-step explanation:

Let the first number be x and the second number be y

Since it says "9 is the difference between two numbers", the first equation will be x-y=9

It also says that "their sum is 31". That means the second equation will be x+y=31

here are the two equations:

x-y=9

x+y=31

You can solve this any way you like, but I'll show elimination

add the two equations

x-y=9

x+y=31

2x=40

divide by 2

x=20

Substitute 20 as x in one of the equations

20+y=31

subtract 20 from both sides

y=11

That means the two numbers are 20 and 11

Hope this helps!

4 0
3 years ago
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