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3 years ago

6

A culture started with 1000 bacteria. After 2 hours, it grew to 1200 bacteria. Predict how many bacteria will be present after 1

3 hours. Round your answer to the nearest whole number.

1 answer:

Harlamova29_29 [7]3 years ago

8 0

You're not allowed to have bacteria in 2020

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Please help (geometry)

jarptica [38.1K]

<h3>Answer: 54 degrees (third choice)</h3>

Explanation:

AB is a diameter of circle C. This leads to angle ACB being 180 degrees. By Thales Theorem (a special case of the inscribed angle theorem) we know that angle D is 90 degrees.

Therefore, triangle ADB is a right triangle. The acute angles (A and B) add to 90, and we can say they are complementary angles.

A+B = 90

36+B = 90

B = 90-36

B = 54 degrees

6 0

4 years ago

Two cards are selected from a standard deck of 52 playing cards. the first is replaced before the second card is selected. find

Iteru [2.4K]

<span>The correct answer is
</span> Find the probability of selecting a diamond and then selecting a queen.

standard deck of 52 playing cards

<span>hearts: 2, 3, 4, 5, 6, 7, 8, 9, 10, j, q, k, A---- > 13 cards</span>

<span>clubs: 2, 3, 4, 5, 6, 7, 8, 9, 10, j, q, k, A---- > 13 cards</span>

<span>spades: 2, 3, 4, 5, 6, 7, 8, 9, 10, j, q, k, A---- > 13 cards</span>

<span>diamonds: 2, 3, 4, 5, 6, 7, 8, 9, 10, j, q, k, A---- > 13 cards</span>

a) The probability of selecting a diamond is 13/52

<span>b) </span>The probability of selecting a queen is 4/52

<span>c) </span>The probability of selecting a diamond and then selecting a queen is

(13/52)*(4/52)=0.0192------------->1.92%

6 0

3 years ago

Select the correct answer. Sean and Colleen are raking leaves in their yard. Working together, they can clear the yard of leaves

Lera25 [3.4K]

Answer:

40 minutes

Step-by-step explanation:

Let c represent the number of minutes it would take colleen to finish the job when he is working alone. Hence, it can be represented by the equation:

$\frac{1}{c}+\frac{1}{c+20} =\frac{1}{24} \\\\Finding\ the\ L.C.M\ of\ the\ fraction\ to\ get\ 24c(c+20)\ as\ the\ L.C.M.\\Multiply\ the\ whole\ equation\ by\ 24c(c+20):\\\\\frac{1}{c}(24c(c+20))+\frac{1}{c+20}(24c(c+20)) =\frac{1}{24}(24c(c+20)) \\\\24c+480+24c=c^2+20c\\\\48c+480=c^2+20c\\\\c^2+20c-48c-480=0\\\\c^2-28c-480=0$

Solving the quadratic equation to get c gives:

c = -12 and c = 40

Since the time cannot be negative, hence c = 40 minutes.

It would take colleen 40 minutes to clear the yard of leaves alone

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3 years ago

How to set up inequalities

melamori03 [73]

X=any number

x is( greater than sign) (and then a line at the bottom of the greater or less than sign) x

it would be like this
x is greater than or equal to x
or
x is less than or equal to x

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4 years ago

Last season, a volleyball team won 40\%40% of 8080 games played.

IRISSAK [1]

Answer:

Happy Chrismas friend!

8 0

3 years ago