The numbers will have the form 1XXXX5, in this case, the order is important because 123465 is a different number to 123645. To know the total of differents decimal numbers, use the formula of permutation with repetition:

$n^r$

$n$ is the number of options, $n=10$ , and $r$ the number of times you have to place a digit, $r=4$ .

$10^4=10000$

3 0

3 years ago

If anybody could help with this question I would appreciate it so much!!

elena-14-01-66 [18.8K]

Answer:

d=7

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

I keep forgetting the process for this: 3(x^2 + 5)(x^2 - 5) Can someone help?

Snezhnost [94]

Answer:

see explanation

Step-by-step explanation:

Note that (x² + 5)(x² - 5) are the factors of a difference of squares

a² - b² = (a + b)(a - b)

with a = x² and b = 5, hence

(x² + 5)(x² - 5) = (x²)² - 5² = $x^{4}$ - 25, thus

3( $x^{4}$ - 25) = 3 $x^{4}$ - 75

5 0

3 years ago