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Shalnov [3]
2 years ago
13

Q#7: Solve for the variable: 3(x+2) - 9 = 15 - 4(5x - 2) Make sure you round you answer to the nearest whole number.

Mathematics
1 answer:
masya89 [10]2 years ago
3 0

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\blue\textsf{\textbf{\underline{\underline{Question:-}}}}

3(x+2)-9=15-4(5x-2)

\blue\textsf{\textbf{\underline{\underline{Answer and How to Solve:-}}}}

  First use the distributive property of both sides:-

3(x+2)-9=15-4(5x-2)

3x+6-9=15-20x+8

Now add 20x on both sides:-

23x+6-9=15+8

On simplification,

23x-3=23

Add 3 to both sides:-

23x=26

Divide by 23 on both sides:-

x=26/23

<h3>Good luck.</h3>

     

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Of his 94 compact discs, Raul plans to donate 17 to the thrift store. To the nearest tenth of a percent, what percent is this?
Masteriza [31]
For this case we can solve the problem by means of the following rule of three:
 94 --------> 100%
 17 --------> x
 Clearing x we have:
 x = (17/94) * (100)
 x = 18,08510638%
 To the nearest tenth of a percent:
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 Answer:
 
This is 18.1% of his compact discs.
6 0
3 years ago
Substitution method <br><br> x-7y=-9<br> -x+8y=10
max2010maxim [7]

Answer:

x = -2, y=1

Step-by-step explanation:

x-7y=-9---------------------equation 1

-x+8y=10-------------------equation 2

From equation 1, make x the subject of formula

x=7y-9----------------------equation 3

substituting x=7y-9 in equation 2,

-(7y-9)+8y=10

Expanding bracket

-7y+9+8y=10

Collecting like terms

8y-7y=10-9

y=1

substituting y=1 in 3

x=7(1)-9

x=7-9

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7 0
3 years ago
On the Algebra test the number of students who got a grade A was three more than twice the number of students who got lower grad
svlad2 [7]
X= # students who got lower grades
2x+3= # students with grade A

STEP 1:
Add the two sets above equal to 24.

x + (2x + 3)= 24
combine like terms

3x + 3= 24
subtract 3 from both sides

3x= 21
divide both sides by 3

x= 7 (# students lower than A)


STEP 2:
substitute x value from step 1 to find # grade A students

=2x + 3
=2(7) + 3
=14 + 3
=17 (# grade A students)


CHECK:
x + (2x + 3)= 24
7 + 2(7) + 3= 24
7 + 14 + 3= 24
24= 24


ANSWER: There were 17 students with grade A.

Hope this helps! :)
4 0
3 years ago
Does someone know how to answer number 8, do I have something wrong? I need a bit of help!
morpeh [17]
Probably be what if the teacher had a number -10
6 0
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write the Converse of the conditional statement below. Determine the truth value, if false explain or give a counterexample.cond
zalisa [80]

hello

from the question given, when two angles form a linear pair, they must be equal to 180 degrees. hence the answer is true

8 0
1 year ago
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