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fgiga [73]
3 years ago
9

If 7x+2=5x, what is the value of -x?

Mathematics
2 answers:
yaroslaw [1]3 years ago
4 0
The value of x is -1.
7x+2=5x
2=-2x
-1=x
fomenos3 years ago
3 0

Answer:

x = -1

Step-by-step explanation:

We must solve 7x+2=5x for x.  To do this, subtract 5x from both sides:

2x + 2 = 0, or

2x = -2, or

x = -1

The solution is x = -1.

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What % could i make 2/5 of a hour? like 10% of a hour. like that.
yarga [219]

well, we can say that 1 hour is 100%, what is 2/5 hr off of it in percentage?

\begin{array}{ccll} hour&\%\\ \cline{1-2} 1 & 100\\ \frac{2}{5}& x \end{array} \implies \cfrac{1}{~~ \frac{2}{5}~~}=\cfrac{100}{x}\implies \cfrac{5}{2}=\cfrac{100}{x} \\\\\\ 5x=200\implies x=\cfrac{200}{5}\implies x=40

7 0
2 years ago
7. lid fills his sports bottle with 1.2 liters of water After his bike ride he drinks milliliters of the water How much waters le
Goryan [66]
1 litre = 1000 millilitres so 1200-200= 1000 millilitres left or 1 litre left
3 0
3 years ago
i am thinking of a number. i multiply 5 and add 55. i get the same answer if i multiply by 9 and subtract 13. what is my number
IceJOKER [234]

Answer:

um maybe 9 you dont really specify what were multiplying bye

5 0
3 years ago
A company made 13,450,000 in sales last year write this number in scientific notation
3241004551 [841]

Answer:

1.345*10^7

Step-by-step explanation:

Here we need to rewrite 13,450,000 in scientific notation, which looks like x.xx*10^n.

To move the decimal point in 13,450,000 to its proper place between the 3 and the 4, a move of 7 digits, we need to multiply 1.345 by 10^7.

13,450,000 in scientific notation is 1.345*10^7.

5 0
3 years ago
What is the rounding or compatible number<br><br> of 256+321
Nana76 [90]
<span>Compatible </span>numbers for 256...
1. Rounded to the nearest hundred = 200
2. Rounded to the nearest tens place = 260

Compatible numbers for 321...
1. Rounded to the nearest hundred = 300
2. Rounded to the nearest tens place = 320

I hope this helps! :)


4 0
3 years ago
Read 2 more answers
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