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3 years ago

Can you help me i Don’t understand

Mathematics

1 answer:

snow_tiger [21]3 years ago

7 0

Answer:

A. {-1, 2, 7}

Step-by-step explanation:

For a set of ordered pairs, the domain is the set of first-numbers (x). The range is the set of second numbers (y, or g(x)).

The first step here is to find the g(x) values for each of the listed x-values.

The attachment shows a table.

Often, we like to list the domain and/or range values in numerical order, eliminating any duplicates. That is, the set of range values {2, -1, -1, 7} would be listed as ...

{-1, 2, 7} . . . . . . matches choice A

_____

You find the g(x) values by substituting for x and doing the arithmetic.

g(-2) = (-2)² -2 = 4 -2 = 2, for example

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Lizzie buys 3 clocks for a total cost of £50 at a car boot sale. She sells 2 clocks for £22 each and the other for clock for £20

Vlad [161]

Answer:

yes she made 30% profit it says she sell 2 clocks for 20 and 22 each for the other ones

Step-by-step explanation:

3 0

3 years ago

The vertices of triangle ABC are A(2, -5), B(-3, 5), and C(3, -3). The triangle is reflected over the x-axis. Use arrow notation

sergiy2304 [10]

Okay, here goes. Notice that since the line of reflection was the x-axis, the x-coordinate of each vertex stays the same and the y-coordinate of each vertex is the opposite of the original vertex, so in that case the answer is 4 or D.

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3 years ago

What is the standard deviation of the data set given below 5 7 9 11 13

AURORKA [14]

Answer:

3.1623 (sqrt(10))

Step-by-step explanation:

Standard Deviation is calculated by first squaring the differences between the observations and the mean and then taking the square root of the sum of the squares of the differences divided by the number of observations - 1.

Mean = Sum of Observations/Total Observations

Mean = (5 + 7 + 9 + 11 + 13)/5 = 45/5 = 9.

Square of the mean = 9^2 = 81.

Now subtracting the mean from each observation and squaring it gives:

(5 - 9)^2 = (-4)^2 = 16

(7 - 9)^2 = (-2)^2 = 4

(9 - 9)^2 = (0)^2 = 0

(11 - 9)^2 = (2)^2 = 4

(13 - 9)^2 = (4)^2 = 16

Sum of squares = 16 + 4 + 0 + 4 + 16 = 40.

Standard deviation = sqrt(40/4) = sqrt(10) = 3.16 (correct to 2 decimal places).

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4 0

3 years ago

Please help with these problems.

DiKsa [7]

13 should be b and
14 is a because geometric mean to have a common ratio

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3 years ago

What is an equation of the line that passes through the points (2, - 1) and (3, - 4)

lianna [129]

Answer:

y=-3x+5

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(-4-(-1))/(3-2)

m=(-4+1)/1

m=-3/1

m=-3

y-y1=m(x-x1)

y-(-1)=-3(x-2)

y+1=-3x+6

y=-3x+6-1

y=-3x+5

4 0

3 years ago