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3 years ago

A 4-digit code is used to open a safe. The digits used are 0 through 9.

Mathematics

1 answer:

bagirrra123 [75]3 years ago

3 0

There are 10,000 possible values the digits 0 and 9 can be arranged as a 4-digit number.

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What is the quadratic. Formula?

balu736 [363]

Answer:

$x = \frac{ - b ± \sqrt{ {b }^{2} - 4ac } }{2a}$

Step-by-step explanation:

For example, we'll use this quadratic equation.

${x}^{2} + 5x + 6$

To understand how to plug it into the formula we need to know what each term represents.

$a {x}^{2} + bx + c$

So the equation above would be put into the formula like this.

$x = \frac{ - 5± \sqrt{ {5}^{2} - 4(1)(6) } }{2(1)}$

Then we would solve

$\frac{ - 5± \sqrt{25 - 24} }{2} \\ \\ = \frac{ -5±1}{2}$

Now, the equation will branch off into one that solves when addition and one when subtraction.

$\frac{ - 5 + 1}{2} = \frac{ - 4}{2} = - 2 \\ \\ \frac{ - 5 - 1}{2} = \frac{ - 6}{2} = - 3$

So x={-3, -2} (-3 and -2)

6 0

3 years ago

1 - 10x = 81 <br> Value of X?

igomit [66]

x = -8

Step-by-step explanation:

Step 1: Subtract 1 from both sides

$1 - 10x - 1 = 81 - 1 \\ - 10x = 80$

Divide both sides of the equation by -10

$\frac{ - 10x}{ - 10} = \frac{80}{ - 10} \\ \\ x = - 8$

4 0

3 years ago

Read 2 more answers

Some public goods and services are provided by the federal government, others by state governments, and still others by local ci

creativ13 [48]

Answer:

If this is supposed to be a math problem o think you messed up writing it

Step-by-step explanation:

7 0

3 years ago

A square dance floor has a perimeter of 120 yards. What is the length of a diagonal of the dance floor?

Crazy boy [7]

Answer:

Hey!

Your answer is C.42.4yd

Step-by-step explanation:

There are 2 ways you can work this on out...

1. Using Pythagoras Theorem...

= 30^2 + 30^2 = 1,800 (30^2=900 so you've added 2 of those to make 1,800)

= SQUARE ROOT THE ANSWER OF 1,800

$\sqrt{x} 1,800$ = 42.42640687119285‬

TO GET A MORE PRECISE ANSWER WE ROUND IT UP TO 1 decimal place

= 42.4 yd is the diagonal length of the dance floor!!

HOPE THIS HELPS!!

6 0

3 years ago

A. -5<br> B. 4<br> C. -4<br> D. 5

Nostrana [21]

The answer is D. In the function $y=4/(x-5)$ , A value of 5 would make the denominator 0. This is undefined, so 5 is excluded.

4 0

3 years ago