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3 years ago

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