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Rashid [163]
4 years ago
13

A lock on a fence door has a 4 digit combination. Each digit can be any number

Mathematics
2 answers:
Bas_tet [7]4 years ago
6 0

Answer:

D. 9990 possible combinations

Step-by-step explanation:

The first digit has 10 choices (can be all of them), the second digit also has 10 choices. The third and fourth digits also have 10 choices.

Multiply them together you get 10*10*10*10 = 10000 possible combinations.

But since all 4 characters cannot be the same, we subtract 10 from 10000 (there are 10 combinations which the 4 characters are the same: 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, and 0000) and we get 9990.

Savatey [412]4 years ago
4 0

Answer:

D. 9990 possible combinations

Step-by-step explanation:

A lock on a fence door has a 4 digit combination. Each digit can be any number  between 0 – 9. The only restriction is that all 4 characters cannot be the same  (e.g. 1111, 2222, 3333, etc.). Therefore, there are 9990 possible combinations.

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Step-by-step explanation:

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3 years ago
The sum of 1/3 of a number and 12
muminat

Start by assigning a variable name to the "number" -- call it x.

Now write out what they say:

"The product of 1/3 and the sum of a number and 3" -- that's 1/3 times x + 3, or (1/3)(x + 3) or (x + 3) / 3

It's "between negative one and five"

So that means:

-1 < (x + 3) / 3 < 5

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7 0
3 years ago
Read 2 more answers
Lisa brought half of her savings to the bakery and bought 12 croissants for $14.20. The amount of money she brings home with her
liraira [26]

Answer:

Before going to the bakery, Lisa had more than $32.40.

Step-by-step explanation:

Hi there!

Let x be Lisa´s savings.

She brings half of her savings to the bakery and expends $14.20. What is left is more than $2.00. Then:

x/2 - 14.2 > 2

Let´s solve the inequality:

x/2 - 14.2 > 2

Add 14.2 to both sides of the inequality.

x/2 > 2 + 14.2

x/2 > 16.2

Multiply by 2 both sides of the inequality.

x > 32.4

Before going to the bakery, Lisa had more than $32.40.

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