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3 years ago

Plz answer it fast I will give you ten point

Mathematics

2 answers:

notka56 [123]3 years ago

8 0

i think that true answer is b

vovangra [49]3 years ago

5 0

Answer:C

Step-by-step explanation: Add 2.76 +0.40

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D(1) = 1,d(n) = n.d(n-1) for n ≥ 2

SIZIF [17.4K]

Assuming you're solving for $d(n)$ , we have by substitution

$d(n) = n d(n-1) \implies d(n-1) = (n-1) d(n-2) \\\\ ~~~~ \implies d(n) = n(n-1)d(n-2)$

$d(n) = n d(n-1) \implies d(n-2) = (n-2) d(n-3) \\\\ ~~~~ \implies d(n) = n(n-1)(n-2)d(n-3)$

$d(n) = n d(n-1) \implies d(n-3) = (n-3) d(n-4) \\\\ ~~~~ \implies d(n) = n(n-1)(n-2)(n-3) d(n-4)$

and so on. After $k$ iterations of this, we have the pattern

$d(n) = n(n-1)(n-2)\cdots(n-(k-3))(n-(k-2))(n-(k-1)) d(n-k)$

so that after $k=n-1$ iterations,

$d(n) = n(n-1)(n-2)\cdots(n-(n-3))(n-(n-2)) d(n-(n-1)) \\\\ ~~~~= n(n-1)(n-2)\cdots3\cdot2\,d(1) \\\\ ~~~~ = \boxed{n!}$

3 0

2 years ago

What is the value of a?

Nana76 [90]

Answer:

a^2 = 18 * 4

a^2 = 72

a = 6√2

5 0

3 years ago

Read 2 more answers

What is the image of the point (-5, 4) after a rotation of 270° counterclockwise

Illusion [34]

Answer:

(4, 5)

Step-by-step explanation:

this is the same as a 90° rotation clockwise.

with the coordinates of (-5, 4) we start in the top left quadrant (x values are negative, y values are positive).

and we end up in the top right quadrant (x and y values are positive).

the line from the origin to the point is perpendicular (90° angle) to the line of the origin to the original point, as we just rotated by 90° or 270°.

that means the rules for the slope of perpendicular lines apply :

x and y coordinate differences trade places, and the sign of their ratio is flipped.

luckily, because the origin is the reference point for both lines, the point coordinates are automatically the coordinate differences to (0, 0).

and because we need to get 2 positive coordinates, that means

(-5, 4) turns into (4, 5)

as the alternative (-4, -5) would be in the bottom left quadrant.

5 0

2 years ago

10 + (2 x 3)2 ÷ 4 × 1 over 2 to the power of 3

diamong [38]

Answer:

The admixture of words and math symbols must be rewritten to allow processing towards a correct answer.

Step-by-step explanation:

Use brackets [ ] and up carrot symbol (^, obtained by pushing the shift key at same time as 6 key) to rewrite the question. The order of operations called GEMA (Grouping, Exponents, Multiplication and Division from left to right and then Addition and Subtraction from left to right) can only be done once the symbols are placed to match the textbook question. Math is a language and its symbols must be used in place of words to assure the correct result.

7 0

3 years ago

Read 2 more answers

Monique has 3 eggs and needs to buy more. A store has 6 dozens of eggs. Monique needs to buy at least 2 dozen. The number of egg

babymother [125]

Let

x--------> the number of dozen of eggs

f(x)-------> the number of eggs

we know that

$f(x)=12x+3$