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Alex73 [517]
2 years ago
7

18. Which expression is equivalent to

Mathematics
1 answer:
Amanda [17]2 years ago
6 0

Answer:

D. 14x

Step-by-step explanation:

add 9x to 4x which is 13x then add x to 13x which is 14x

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Margaret [11]

The answer is A: 12/4.

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Can you help me with the first two questions?
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1.\\\$55\ 000-\$1\ 000=\$54\ 000\\\\\$54\ 000:2=\$27\ 000\\\\\\Answer:B



2.\\-4(x-11)=16\\\\-4\cdot x-4\cdot(-11)=16\\\\-4x+44=16\ \ \ /:(-4)\\\\-4x:(-4)+44:(-4)=16:(-4)\\\\x-11=-4\\\\Answer:G
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If anybody now this pls help my homework due TOMORROW
Nezavi [6.7K]

Answer:

<u><em>Part A:</em></u> D. y = (x + 1)(x+3)\\

<u><em>Part B:</em></u> C. 3x(x-3) = 0\\

Step-by-step explanation:

For part A) we just have to plug in 0 for x and solve for y until we find the equation that says 3 is the value for y when x is 0. For purposes of speeding up the process the correct answer is D. I will show how to check for it now.

The equation: y = (x + 1)(x+3)

Now plug in 0 for x.

y = (0 + 1)(0+3)\\

Now solve.

y = (1)(3)

y = 3

This proves that this is the correct answer.

For part B) we just have to plug in the give values for x separately and check for each value of x that it equals 0. For the purpose of speeding up the process the correct answer is C. I will show how to check for it now.

The equation: 3x(x-3) = 0

Now plug in x for 0 and solve:

3* 0 (0-3) = 0\\

0(-3) = 0\\

0 =0\\

This equation is true, now we check for the other value of x, 3.

3*3(3-3) = 0\\

9(0) = 0\\

0 =0\\

This is also true so that means this is the correct answer.

6 0
3 years ago
Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. A vending m
Anuta_ua [19.1K]

Answer:

A) 1.96%

Step-by-step explanation:

You need to know the band between 5.48 g and 5.82 g, the mean is 5.67 g and the standard deviation is .0.070 g, with that information you can calculate the percentage to the left of the mean and the percentage to the right of the mean and add them.

To know its percentage you have to calculate the z score for both values.

z = \frac{x-\mu}{\sigma}

x is the value being evaluated

μ is the mean

σ is the standard deviation

For 5.48 g:

z = \frac{5.48-5.67}{0.070} =-2.714

and is equivalent to 0.0034

For 5.82 g:

z = \frac{5.82-5.67}{0.070} = 2.143

and is equivalent to 0.9838

Those numbers mean that the percentage below 5.48 is equivalent to the 0.34% of the values and the percentage below 5.82 is equivalent to 98.38% of the values. Then the percentage rejected is the percentage above 5.82, 100 - 98.38 = 1.62% plus the percentage below 5.48, 0.34%.

Percentage rejected = 1.62% + 0.34% = 1.96%

7 0
3 years ago
A line passes through the point (4,-9) and has a slope of -6. Write an equation in slope intercept form for this line
pishuonlain [190]

\bf (\stackrel{x_1}{4}~,~\stackrel{y_1}{-9})~\hspace{10em} \stackrel{slope}{m}\implies -6 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{(-9)}=\stackrel{m}{-6}(x-\stackrel{x_1}{4}) \\\\\\ y+9=-6x+24\implies y=-6x+15

6 0
3 years ago
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