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3 years ago

I need help with this one too

Mathematics

1 answer:

meriva3 years ago

3 0

Answer:

1/2+7= 7.5 3/4-1= -0.75

Step-by-step explanation: times the bottom numbers to get the fractions out of the way then solve for X on both equations then find the perimeter

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The graph represents a distribution of data.

chubhunter [2.5K]

Answer:

Mean = 50

Step-by-step explanation:

Step 1: Write the mean formula

Mean = sum of data/ total number of data

Step 2: Calculate the sum of data

35 + 40 + 45 +50 + 55 + 60 + 65 = 350

Step 3: Find the total number of data

Total number of data = 7

Step 4: Calculate the mean

Mean = sum of data/ total number of data

Mean = 350/7

Mean = 50

Therefore, the mean of this data is 50.

5 0

3 years ago

Read 2 more answers

A, B and C lie on a straight line segment.A, E and D lie on a straight line segment.BE = 1.8m, CD = 9m and BC = 1.7m.Work out th

katrin2010 [14]

The relationship between the points is an illustration of similar shapes.

The length of AB is 0.43

The given parameters are:

$\mathbf{BE = 1.8}$

$\mathbf{CD = 9}$

$\mathbf{BC = 1.7}$

From the question (see attachment), we have the following observations:

BE corresponds to CD
AB corresponds to AC

So, the equivalent ratio is:

$\mathbf{AB:BE =AC:CD }$

Substitute known values

$\mathbf{AB:1.8 =AC:9 }$

Express as fractions

$\mathbf{\frac{AB}{1.8} =\frac{AC}{9} }$

Multiply both sides by 1.8

$\mathbf{AB =\frac{AC}{5} }$

AC = AB + BC

So, we have:

$\mathbf{AB =\frac{AB + BC}{5} }$

Substitute 1.7 for BC

$\mathbf{AB =\frac{AB + 1.7}{5} }$

Multiply through by 5

$\mathbf{5AB =AB + 1.7}$

Collect like terms

$\mathbf{5AB -AB =1.7}$

$\mathbf{4AB =1.7}$

Divide both sides by 4

$\mathbf{AB=0.425}$

Approximate

$\mathbf{AB=0.43}$

Hence, the length of AB is 0.43

Read more about similar shapes at:

brainly.com/question/20536565

7 0

2 years ago

Evaluate each expression for a=7,b=4,and c=-3.

stiks02 [169]

Answer:

Step-by-step explanation: 3a-5b= 3(7)-5(4)

=21-20

=1

7-3a+5a+15=7-3(7)+5(7)+15

=7-21+35+15

=-14+50

=36

15a^2-17(bc)^2=15(7)^2-17(4)(-3)^2

=105^2-204^2

=210-408

=-198

3 0

3 years ago

Which of the following sets is equal to {1, 2, 3, ...}?

Rufina [12.5K]

From the list of options, the set that is equal to the set {1, 2, 3, ...} is {x | x N, x ≥ 1}

<h3>How to determine the set?</h3>

The set is given as:

{1, 2, 3, ...}

The three dots (...) after 3 implies that the elements of the set include other values such as 4, 5, 6 and so on

Using the above scenario, we can see that the set {1, 2, 3, ...} contains only positive integers.

All positive integers are natural numbers and they are denoted by N

From the list of options, we have:

{x | x R, x ≥ 1}

This represents the set of all real numbers greater than or equal to 1.

Note that this set includes decimal numbers i.e. 1, 1.5, 1.89 and so on

This does not represent the set {1, 2, 3, ...}

{x | x R, x > 1}

This represents the set of all real numbers greater than 1.

Note that this set includes decimal numbers i.e. 1.5, 1.89 and so on

This does not represent the set {1, 2, 3, ...}

{x | x N, x ≥ 1}

This represents the set of all natural numbers greater than or equal to 1.

Note that this set does not include decimal numbers i.e. 1, 2, 3, 4 and so on

This does represent the set {1, 2, 3, ...}

Hence, the set that is equal to the set {1, 2, 3, ...} is {x | x N, x ≥ 1}