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worty [1.4K]
3 years ago
8

Find an equivalent expression by simplifying 10x+5x-45+7y

Mathematics
2 answers:
maksim [4K]3 years ago
5 0
The answer would be 37

10x+5x-45+7y
15x-45+7
30+7
37
egoroff_w [7]3 years ago
3 0

Answer:

15x-45+7

Step-by-step explanation:

You would add the 10x and the 5x im pretty sure that would simplify it

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Maria is setting up a 20gal salt water fish tank. That needs to have a salt content of 3.5% . if she has water with 2.5% salt an
Natalka [10]
X + y = 20   ---> x = 20 - y

2.5x + 3.7y = (3.5)(20) = 70

--> 2.5(20-y) + 3.7y = 70

--> 50 -2.5y +3.7y = 70

--> 1.2y = 20

--->  y = 16.66

Answer: 16.66 gallons
3 0
3 years ago
Rise= ?<br> Run= ?<br> Slope= ?
Dennis_Churaev [7]

Answer:

Rise = 0

Run = 4

Slope = 0

Step-by-step explanation:

Slope of straight line = \frac{\text{Rise}}{\text{Run}}

Since, given line is passing through two points (-2, -3) and (2, -3),

Rise of the line = -3 - (-3) = 0

Run of the given line = 2 - (-2) = 4

By substituting these values of rise and run in the formula,

Slope = \frac{0}{4}

          = 0

Therefore, Rise = 0

                  Run = 4

                 Slope = 0

Note:  Slope of a line parallel to the x-axis is zero.

           Slope of a line parallel to y-axis is not defined.

8 0
3 years ago
Scores on a college entrance examination are normally distributed with a mean of 500 and a standard deviation of 100. What perce
Alla [95]

Answer:

The percentage is P(350 <  X  650 ) = 86.6\%

Step-by-step explanation:

From the question we are told that

   The population mean is  \mu  =  500

     The standard deviation is  \sigma  =  100

The  percent of people who write this exam obtain scores between 350 and 650    

    P(350 <  X  650 ) =  P(\frac{ 350 -  500}{ 100}

Generally  

               \frac{X -  \mu }{\sigma }  =  Z (The \  standardized \  value \ of  \  X )

   P(350 <  X  650 ) =  P(\frac{ 350 -  500}{ 100}

   P(350 <  X  650 ) =  P(-1.5

   P(350 <  X  650 ) =  P(Z < 1.5) -  P(Z <  -1.5)

From the z-table  P(Z <  -1.5 )  =  0.066807

   and P(Z < 1.5  ) =  0.93319

=>    P(350 <  X  650 ) =  0.93319 -  0.066807

=>  P(350 <  X  650 ) = 0.866

Therefore the percentage is  P(350 <  X  650 ) = 86.6\%

3 0
3 years ago
Raquel and her brother Marcus are huge sports fans. Combined they owe 15 sports jersey. Raquel owns double the amount of Marcus'
Ber [7]

2x + 3 + y = 15 Equation

7 0
3 years ago
camila drew a triangle with a side that is 24 inches long and a side that is 18 inches long. which of the following could be the
Minchanka [31]
Formula: a^2+b^2=c^2
Plug in: 24^2+18^2=c^2
Exponents: 576+324=c^2
Add: 900=c^2
Square root: c=30
So the answer is 30 inches
4 0
3 years ago
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