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n200080 [17]
3 years ago
15

Which expression means the same as "subtract 3 from 7 and then multiply

Mathematics
1 answer:
marishachu [46]3 years ago
5 0

Answer:

A 4* (7 - 3)

Step-by-step explanation:

Let's do this part by part. First we have "subtract 3 from 7:" this means we are taking 3 out of 7.

7 - 3

Next we have "then multiply by 4." So we need to take the above quantity and multiply the whole thing by 4.

(7-3) x 4

or

4 * (7-3)

The answer is A.

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Which set is closed under subtractionWhich answer choice shows that the set of irrational numbers is not closed under addition
vovikov84 [41]

Answer:

(a) Set of rational numbers

(b) \pi + (-\pi) = 0

Step-by-step explanation:

Solving (a): Set that is closed under subtraction

The solution to this is rational numbers.

For a set of number to be closed under subtraction, the following condition must be true

a -b = c

Where

a, b, c are of the same set.

The above is only true for rational numbers.

e.g.

1 - 2 = -1

5 - 5 = 0

\frac{1}{2} - \frac{1}{4} = \frac{1}{2}

4 - 2 = 2

The operations and the result in the above samples are rational numbers.

Solving (b): Choice not close under addition[See attachment for options]

As stated in (a)

For a set of number to be closed under subtraction, the following condition must be true

a -b = c

Where

a, b, c are of the same set.

In the given options (a) to (d), only

\pi + (-\pi) = 0 is not close under addition because:

\pi is irrational while 0 is rational

<em>In other words, they belong to different set</em>

8 0
2 years ago
Which formula(s) can be used to find the nth partial sum of a geometric sequence or the sum of the first n terms of a geometric
ivolga24 [154]

Step-by-step explanation:

An=A1. R raised to the power n-1

6 0
3 years ago
Find the sum of 2.5+3.03
Alenkasestr [34]

Answer: 5.53


Step-by-step explanation:

this is a straight forward addition

2.5+3.03 =5.53

to be clear or to specify, use the decimal point to make the sum:

2.5 = 2 + 0.5       and 3.03 = 3 + 0.03

2+3= 5      and  0.5 + 0.03 = 0.53

5 + 0.53 = 5.53 (but this is to long just to make it clear)


5 0
3 years ago
HELP PLEASE!!!!!! I need help Urgent Help
gavmur [86]
This is just a porportion. So if 250 meters is 1 meter than: 250/1

And it wants to know the height. So we have the first number but not the second. So we'll use x: 212/x

Set them equal to each other 250/1=212/x

Cross multiply: 212=250x

Divide to find x: 212/250=x
x=212/250
x=0.848

So the height of the model, to the nearest 10th would be 0.8 meters.
5 0
3 years ago
The sum of three consecutive whole numbers is 105. Find the numbers.
NNADVOKAT [17]

Answer:

The three consecutive numbers are 34, 35, 36

Step-by-step explanation:

three consecutive numbers:  x+(x+1)+(x+2)

x+x+1+x+2= 105

3x+3=105

    -3   -3

3x= 102

3x/3= 102/3

34=x

But we also need to find (x+1) and (x+2)

34+1= 35

34+2=36

34+35+36= 105

The three consecutive numbers are 34, 35, 36

Hope this helps!

7 0
3 years ago
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