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HACTEHA [7]
3 years ago
11

a culture started with 2000 bacteria. after 4 hours it grew to 2200. predict how many bacteria will be present after 9 hours. ro

und your answer to the nearest whole number

Mathematics
2 answers:
mafiozo [28]3 years ago
5 0

2478

credit doesn't belong to me but here

Sati [7]3 years ago
4 0
First you will divide;
200÷4=50
Then you multiply;
50×9=450
Last you add;
2000+450=2450

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If you remove the last digit (one’s place) from a 4-digit whole number, the resulting number is a factor of the 4-digit number.
shutvik [7]

Answer:

  900

Step-by-step explanation:

We assume that your 4-digit number must be in the range 1000 to 9999. Clearly, any number ending in zero will meet your requirement:

  1000/100 = 10

  3890/389 = 10

However, the requirement cannot be met when the 1s digit is other than zero.

__

For some 3-digit number N and some 1s digit x, the 4-digit number will be

  4-digit number: 10N+x

Dividing this by N will give ...

  (10N+x)/N = 10 remainder x

N will only be a factor of 10N+x when x=0.

So, there are 900 4-digit numbers that meet your requirement. They range from 1000 to 9990.

6 0
3 years ago
Find the smallest solution to the equation 2/3 x^2 =24
lesya692 [45]

Answer:

\frac{2x^2}{3} =24

Step-by-step explanation:

times both sides by 3

2x²=72

divide both sides by 2

x²=36

sqrt both sides

x=+/-6

x=-6 or 6

-6<6 so -6 is the smallest solution

7 0
3 years ago
This figure consists of a rectangle and semicircle.
noname [10]

Answer:

Step-by-step explanation:

A = LW + ½πr²  

A = 15(12) + ½(3.14)(12²/4)

A = 180 + 56.52

A = 236.52 m²

3 0
2 years ago
Luke invited 20 more boys than girls to his birthday party. However, only ¾ of the boys and ⅔ of the girls came. Exactly 19 of L
sveta [45]

Answer:

68

Step-by-step explanation:

Let:

Number of girls invited = x

Number of boys = x +20

3/4 of boy showed up

2/3 of girls showed up

Exactly 19 did not show up

Therefore, we could say:

Fraction of boys that didn't show up = 1 - 3/4 = 1/4

Fraction of girls that didn't show up = 1 - 2/3 = 1/3

That is,

[1/4 *(x + 20)] + [1/3*x] = 19

[(x + 20) / 4] + x /3 = 19

(3(x + 20) + 4x) / 12 = 19

3x + 60 + 4x = 228

7x = 228 - 60

7x = 168

x = 168 / 7

x = 24

Number of girls, x = 24

Number of boys, x + 20 = 24 + 20 = 44

Total friends invited = (24 + 44) = 68

8 0
3 years ago
(x+6)(x-5) what is the degree,leading coefficient,constant term,horizontal interception,vertical intercepts
nikitadnepr [17]

Degree: 2

Leading coefficient: 1

Constant term: -30

Horizontal/X intercepts: (-6, 0) and (5, 0)

Vertical/Y intercept: (0, -30)

Here's a quick rundown: Distribute to find the standard form quadratic. Because it is quadratic, its degree must be 2. There isn't any number before the first variable, so it can be assumed to be 1. The last term, which doesn't have a variable and therefore the constant, is -30. By reversing the signs of the signs of the numbers in the factors, you can easily find the horizontal intercepts/X-intercepts/zeros/roots which are (-6, 0) and (5, 0). The constant term will in most cases also be the Y-intercept/horizontal intercept. Therefore the Y-intercept is (0, -30) This applies to this equation because there is nothing being multiplied across the entire equation.

5 0
2 years ago
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