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Serggg [28]
2 years ago
8

How many 7-digit numbers can be

Mathematics
1 answer:
padilas [110]2 years ago
4 0

Answer: 5040 7-digit numbers

Step-by-step explanation:

Permutations:

1: 1 ==> 1 permutation ==> 1 ==> 1!

12: 12, 21 ==> 2 permutations ==> 1*2 ==> 2!

123: 123, 132, 213, 231, 312, 321 ==> 6 permutations ==> 1*2*3 ==> 3!

7-digits: 7!=

1*2*3*4*5*6*7=5040 7-digit numbers

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(5x +252 +X+5) + (x+4)
nikdorinn [45]

Answer: 7x + 261

Step-by-step explanation:

(5x + 252 + x + 5) + (x + 4)

5x + 252 + x + 5 + x + 4 (get rid of parenthesis)

7x + 261 (combine like terms)

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3 years ago
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What is the value of x in the diagram below? 2 right triangles are stacked. The bottom triangle has a side length of 9 units and
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18 sqrt2/ sqrt3

Step-by-step explanation:

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The lines graphed below are perpendicular. The slope of the redline is -2. What is the slope of the green line
attashe74 [19]

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It would be undefined if the line is vertical.

Step-by-step explanation:

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3 years ago
A group of related facts that use the same numbers is an
nika2105 [10]
A group of related facts that use the same number is a fact family
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3 years ago
The fifth grade teachers took their classes on a field trip to museum first group had 25 students and two teachers and cost $97.
iren [92.7K]

Answer:


Step-by-step explanation:

S=student cost; T=teacher cost

.

32S+3T=$127 . Multiply this by 2.

64S+6T=$254 Subtract this below

.

25S+2T=$97.50 . Multiply this by 3.

75S+6T=$292.50

64S+6T=$254 . Subtract this (from above.)

.

11S=$38.50

S=$3.50

ANSWER 1: Student tickets cost $3.50.


.

32S+3T=$127

32($3.50)+3T=$127

$112+3T=$127

3T=$15

T=$5.00

ANSWER 2: Teacher tickets cost $5.00.

.

CHECK:

25S+2T=$97.50

25($3.50)+2($5.00)=$97.50

$87.50+$10.00=$97.50

$97.50=$97.50


4 0
3 years ago
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