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Alja [10]
3 years ago
15

Elena said the equation 9x+15=3x+15 has no solutions because 9x is greater than 3x. Do you agree with Elena? Explain your reason

ing.
Mathematics
2 answers:
baherus [9]3 years ago
8 0

Answer:

Disagree

Step-by-step explanation:

You can solve this problem by doing as follows:

9x+15=3x+15

-3x        -3x

=

6x+15=15

-15        -15

=

6x=0

Although x=0, x=0 is still a solution to the problem.

erik [133]3 years ago
5 0

Answer:

yes

Step-by-step explanation:

any number times nine will be greater if you times the same number by three,

ex:

9(5)+15=60

3(5)+15=30

9x+15 > 3x+15

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How much does 1 candy bar cost if 112 candy bars cost $78.00?
Alexxandr [17]
$0.70 per candy.
$78 divided by 112 gives $0.696, so by rounding off, you get 0.70
5 0
3 years ago
Find the value of X and y .If order pair (X,y)=(6,7)​
Darina [25.2K]

Answer:

x=6,y=7

Step-by-step explanation:

In a coordinate pair it is assumed that the first number is x, and the 2nd is y.

7 0
3 years ago
[(3•2+5)2]2-4 12356789
Gelneren [198K]

Answer:

−49427112 us the correct answer

8 0
3 years ago
a plane flying with the wind travels 630 mi in 1.5hrs. Flying against the wind , the plane travels 1120 mi in 4hrs. Find the rat
Flauer [41]
\bf \begin{cases}
r=\textit{rate of the plane}\\
w=\textit{rate of the wind}\\
\end{cases}
\\\\

\begin{array}{ccccllll}
&distance&rate&time(hrs)\\
&\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\
\textit{with wind}&630&r+w&1\frac{1}{2}\\
\textit{against wind}&1120&r-w&4
\end{array}


\bf thus  \begin{cases}
630=(r+w)1\frac{1}{2}\to 630=(r+w)\frac{3}{2}
\\\\
1120=(r-w)4\\
--------------\\
630=(r+w)\frac{3}{2}\implies 630\cdot \frac{2}{3}=r+w\\
420=r+w\implies \boxed{420-w}=r\\
--------------\\
thus\\
--------------\\
1120=(r-w)4\implies 1120=4r-4w
\\\\
1120=4(\boxed{420-w})-4w
\end{cases}


solve for "w", to find the wind's speed rate,

so hmmm what's the plane's rate?  well 420 - w = r  :)
5 0
3 years ago
Flor tiene una papelería y vende los lápices en $12 y los bolígrafos en $20. ¿Qué expresión algebraica permite saber cuánto debe
stiks02 [169]

Answer:

c=120x+200y

Step-by-step explanation:

La expresión algebraica debería indicar que el valor total que debe cobrar Flor es igual a 10 que representa el número de bolsas por el resultado de la suma del precio de cada item por la cantidad, lo que se puede expresar de la siguiente forma:

c=10(12x+20y)

c=120x+200y

De acuerdo a esto, la expresión algebraica que permite saber cuánto debe cobrar Flor por 10 bolsas que contengan x cantidad de lápices y "y" cantidad de bolígrafos es c=120x+200y.

7 0
3 years ago
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