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kozerog [31]
2 years ago
12

Which expression is equivalent to 4 − (−7)? A 7 + 4 B 4 − 7 C −7 − 4 D −4 + 7

Mathematics
2 answers:
jeyben [28]2 years ago
6 0

Answer:

A.7+4

Step-by-step explanation:

4-(-7)

b/c negative times negative is postive

-(-)=+

-(+)= -

+(+)=+

hope it's helpful

THANK YOU.

ELEN [110]2 years ago
3 0

Answer:

7+4

Step-by-step explanation:

When you are subtracting a negative, you are really adding the number. For example, four minus negative seven is equal to four plus seven.  

4 - (-7) = 4+7

4+7 = 7+4 (By the commutive property of addition)

Let me know if this helps!

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If it takes 3 men 5 hours to dig 12 holes, how many hours does it take for 3 men to dig 84 holes?
alexgriva [62]

Answer:

Hence it will take 35hours

Step-by-step explanation:

Let the time it took to dig hole be x

Ley the number of holes be n

Using the relationship x = kn (direct relationship)

if it takes 3 men 5 hours to dig 12 holes, hence;

when x = 5, n = 12

k = x/n

k = 5/12

To get how many hours it take for 3 men to dig 84 holes, then;

when n = 84, x = ?

x = 5/12 * 84

x = 5 * 7

x = 35hours

Hence it will take 35hours

8 0
3 years ago
Which of the following is a rational number?
Anastaziya [24]

Answer:

none of them are rational

Step-by-step explanation:

hope this helped you! :D

7 0
3 years ago
tamara has completed 60% of her practice time for the track meet. If she is expected to practice for 18h, how long has she alrea
anyanavicka [17]

Answer:

10h and 48min

Step-by-step explanation:

60*18=1080

1080/100=10.8

so 10.8h which means 10 hours and 48 min

4 0
2 years ago
The length of a rectangle is 4 centimeters more than twice its width of the perimeter of the rectangle is 86centimeters find the
lana66690 [7]

Answer:

Width= 13 cm

length=30cm

Step-by-step explanation:

Let the length of the rectangle be 'L'

And the width of the rectangle be 'W'

Perimeter= 86 cm

According to the statement:

        Length= 2*Width+4\\L=2W+4

Perimeter of a rectangle= 2(Length+Width)

86=2(2W+4+W)\\86/2=3W+4\\43=3W+4\\3W=43-4\\3W=39\\W=39/3\\W=13 cm\\\\Length(L)=2W+4\\=2(13)+4=26+4=30 cm\\Length=30 cm

                               Width= 13 cm

                                length=30cm

6 0
3 years ago
What would the answer be
Hoochie [10]

Answer:

B.

Step-by-step explanation:

process of elimination. the red dot is not a 1/4 of the number of lines, so it cant be 12.25, 13.625 is impossible because it has a value less than 13, and 12.625 is impossible as well because it has a value less than 12.5 therefore 12.375 is the best answer, and the only correct answer

4 0
3 years ago
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