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Masja [62]
3 years ago
7

Charlie solved an equation, as shown below:

Mathematics
1 answer:
Alex73 [517]3 years ago
6 0
Part A:  Charlie's answer is incorrect
In step 2 of Charlie's answer he subtracted 5 from each side.  Since 5x is multiplication, he must DIVIDE each side by 5 to get x by itself.  The problem should have worked out like this...

Step 1:  5x = 30
Step 2:  x = 30/5
Step 3:  x = 6

Part B:  There is only 1 solution for this problem.
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80 people attended a meeting. There was x men and x women and the rest were children. How many children attended the meeting
sesenic [268]

Answer:

<em>80 - 2x</em>

Step-by-step explanation:

Given

Total number of people = 80 people

Total men = x men

Total women = x women

Let the number of childeren be c

x + x + c = 80

Make c the subject of the formula

c = 80 - (x+x)

c = 80 - 2x

<em>Hence the total children attending is 80 - 2x</em>

4 0
3 years ago
Help and explain pls and ty
agasfer [191]

\displaystyle\bf (3-5\sqrt{5} )-(5\sqrt{3} -3)=3+3-5\sqrt{5} -5\sqrt{3} =\boxed{6-5\sqrt{5} -5\sqrt{3} } \\\\\\\\\sqrt{5} (\sqrt{5} -2x)=\boxed{-2x\sqrt{5} +5}

8 0
3 years ago
Evaluate the expression below when x = -2.<br><br> x2 − 8<br><br> x + 6
IRISSAK [1]
First, substitute -2 into each equation where there is an <span>x:
</span>(-2)2 -8<span>
</span>(-2) +6

Then multiply the -2 and the 2 in the first equation and add -2 and 6 in the second:
-4 -8
4

Lastly, subtract -4 and 8:
-12
4

Now you have you answers -12 and 4!
3 0
3 years ago
What does 45 - 4x equal
xxTIMURxx [149]
Let y = 0 to find the x-intercept(s).

0 = 45 − 4x

*Then subtract 45 from both sides*
-45 = -4x

*Next, DIVIDE both sides by -4*

-45
—— = x
-4

*NEXT, realize that TWO NEGATIVES MAKE A POSITIVE *

45. 4
——— = x {FLIP} x=——-
4. 45.


y-Intercept

Let x = 0 to find the y-intercept(s).


y = 45 −4(0)

NEXT, SIMPLIFY:

y=45
7 0
3 years ago
1 less than the square of a number.
julsineya [31]

Answer: 1 is not a perfect square. 3 is the only prime number one less than a square.

7 0
2 years ago
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