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3 years ago

How to do permutations?

1 answer:

7 0

Permutations are written as nPx where n is the number of total choices possible and x is the number of choices that will be used. This is calculated as nPx = n! / (n-x)!.
Permutations represent the number of ways we can choose x objects from n possibilities where the order of selection matters.

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5x-4y=19<br> x+2y=8<br> solve the simaltaneous equation

STatiana [176]

Answer:

( 5, 3/2 )

x = 5

y = 3/2

Step-by-step explanation:

5x - 4y = 19

x + 2y = 8

-------------------

2(x + 2y = 8) = 2x + 4y = 16

----------------------

5x - 4y = 19

2x + 4y = 16

7x = 35

÷7 ÷7

x = 5

-----------------------

x + 2y = 8

5 + 2y = 8

-5 -5

2y = 3

÷2 ÷2

y = ( 3/2 )

I hope this helps!

8 0

2 years ago

9100 dollard placed into an account with an annual intrest of 5% to the neareast year how long will it take for the account to v

shusha [124]

Answer:

81 years

Step-by-step explanation:

The answer is 81 because 5% of 9100 is 455 and 36900 divided by 455 is rounded to 81.

4 0

3 years ago

What is not a solution of -4 < x

Gnesinka [82]

Answer:

-5

Step-by-step explanation:

because it is less than -4 when it is suppose to be more than-4

8 0

3 years ago

Read 2 more answers

The prism shown has a volume of 35cm³. Work out the height of the triangular cross section. The length going back is 7cm and the

Gre4nikov [31]

Answer:

2.5 cm

Step-by-step explanation:

The volume of a triangular prism is cross section × length.

The cross section area is the triangle area. The triangle length is 4 cm, the height is not given. The length of the triangular prism is 7cm.

4 × h × 1/2 × 7 = 35

14h = 35

h = 35/14

h = 5/2

The height of the triangular cross section is 2.5 cm.

3 0

3 years ago

Find the product.<br> (x-2) (x-3)

ivann1987 [24]

Answer:

Expand the polynomial using the FOIL method.

x2-5x+6

Step-by-step explanation:

happy to help.

4 0

3 years ago