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guajiro [1.7K]
3 years ago
14

If x=3 and y=2, then 2x -y=

Mathematics
1 answer:
melomori [17]3 years ago
4 0

Answer:

2x-y=2

Step-by-step explanation:

sub the numbers in for your variables

2(3)-2=

6-2= 4


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D=√(-4-42.78)^2 + (3-44.78)^2
svetlana [45]

The expression is equal to 3sqrt(517)/5

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1 year ago
A number y is five times greater than two added to a number x.write an expression for y in terms of x.if x = 3, what is y
Oduvanchick [21]

Answer:

y=5x+10 or y=25 (i'm not sure what they're asking)

3 0
3 years ago
Y= 4x +3, 4x + y =3 are they parallel or perpendicular
FrozenT [24]

Answer:

they are perpendicular  

Step-by-step explanation:

because the slope are opposite which means the lines intersect.

5 0
3 years ago
Read 2 more answers
Calculate the sample standard deviation and sample variance for the following frequency distribution of hourly wages for a sampl
lidiya [134]

Answer:

(a) The sample variance is 16.51

(a) The sample standard deviation is 4.06

Step-by-step explanation:

Given

\begin{array}{cc}{Class} & {Frequency} & 8.26 - 10.00 & 20 &10.01-11.75 & 38 &11.76 - 13.50& 36 & 13.51-15.25 &25&15.26-17.00 &27 &\ \end{array}

Solving (a); The sample variance.

First, calculate the class midpoints.

This is the mean of the intervals.

i.e.

x_1 = \frac{8.26+10.00}{2} = \frac{18.26}{2} = 9.13

x_2 = \frac{10.01+11.75}{2} = \frac{21.76}{2} = 10.88

x_3 = \frac{11.76+13.50}{2} = \frac{25.26}{2} = 12.63

x_4 = \frac{13.51+15.25}{2} = \frac{28.76}{2} = 14.38

x_5 = \frac{15.26+17.00}{2} = \frac{32.26}{2} = 16.13

So, the table becomes:

\begin{array}{ccc}{Class} & {Frequency} & {x} & 8.26 - 10.00 & 20&9.13 &10.01-11.75 & 38 &10.88&11.76 - 13.50& 36 &12.63& 13.51-15.25 &25&14.38&15.26-17.00 &27 &16.13\ \end{array}

Next, calculate the mean

\bar x = \frac{\sum fx}{\sum f}

\bar x = \frac{20*9.13 + 38 * 10.88+36*12.63+25*14.38+27*16.13}{20+38+36+25+27}

\bar x = \frac{1845.73}{146}

\bar x = 12.64

Next, the sample variance is:

\sigma^2 = \frac{\sum f(x - \bar x)^2}{\sum f - 1}

So, we have:

\sigma^2 = \frac{20*(9.13-12.63)^2 + 38 * (10.88-12.63)^2 +...........+27 * (16.13 -12.63)^2}{20+38+36+25+27-1}

\sigma^2 = \frac{2393.6875}{145}

\sigma^2 = 16.51

The sample standard deviation is:

\sigma = \sqrt{\sigma^2}

\sigma = \sqrt{16.51}

\sigma = 4.06

6 0
2 years ago
You invest $1500 in a bank account that has a 3% annual interest rate, compounded continuously. How much will you have in 15 yea
Mandarinka [93]
We use the formula:
Total = Principal * e ^ (rate * years)
Total = 1,500 * e ^ (.03 * 15)
Total = 1,500 * e ^ .45
Total = 1,500 * <span> <span> <span> 1.5683121854 </span> </span> </span>
Total = <span> <span> <span> 2,352.47 </span> </span> </span>


8 0
3 years ago
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