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Alex Ar [27]
3 years ago
6

Please help it’s a test

Mathematics
2 answers:
Andrew [12]3 years ago
5 0

Answer:

12 dollars

Step-by-step explanation:

equatioms

igor_vitrenko [27]3 years ago
3 0

Answer:

x = 12 ($12)

Step-by-step explanation:

3x - 4 = 2x + 8

x = 12

...

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About 2% of the population has a particular genetic mutation. 1000 people are randomly selected. Find the mean for the number of
Alla [95]

Answer:

Step-by-step explanation:

We khow that the genetic mutation affect 2 percent of the population .

Let's try to understand what does this mean :

  • in a group of 100 people there is possibility of finding 2 people with this genetic mutation
  • in a group of 1000 the possibility raises to 20 people so we can deduce that each time we add a zero we add a zero in 2

so :

  • 100⇒2
  • 1000⇒20
  • 10000⇒200
  • 100000⇒2000

and so on

6 0
3 years ago
Simplify
frosja888 [35]
Just do this :
-1 + 30 - 5y
29 - 5y
or -5y + 29
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3 years ago
The height, h, in feet of a rock above the ground is given by the equation h = -16t^2 + 24t + 16, where t is the time in seconds
boyakko [2]

The rock will hit the ground at 2 seconds.

Explanation:

Given that the height, h, in feet of a rock above the ground is given by the equation h=-16t^2+24t+16, where t is the time in seconds after the rock is thrown.

We need to determine the time at which the rock will hit the ground.

To determine the time, let us equate the height h = 0 in the equation h=-16t^2+24t+16, we get,

0=-16t^2+24t+16

Switch sides, we have,

-16 t^{2}+24 t+16=0

Let us solve the equation using the quadratic formula.

Thus, we have,

t=\frac{-24 \pm \sqrt{24^{2}-4(-16) 16}}{2(-16)}

Simplifying, we get,

t=\frac{-24 \pm \sqrt{576+1024}}{-32}

t=\frac{-24 \pm \sqrt{1600}}{-32}

t=\frac{-24 \pm 40}{-32}

Hence, the two values of t are

t=\frac{-24 + 40}{-32}   and   t=\frac{-24 -40}{-32}

Simplifying the values, we get,

t=\frac{16}{-32}  and  t=\frac{-64}{-32}

Dividing, we get,

t=-\frac{1}{2}  and  t=2

Since, t cannot negative values, we have,

t=2

Thus, the rock will hit the ground at 2 seconds.

8 0
3 years ago
Is a percent a number?
mars1129 [50]
Yes, percent is a number.
7 0
3 years ago
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frutty [35]
Stan Han Jisung!!!!!He literally cute!!hdbdbdkkdjd

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