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Troyanec [42]
3 years ago
11

In a lab experiment, 60 bacteria are placed in a petri dish. The conditions are such that the number of bacteria is able to doub

le every 21 hours. How long would it be, to the nearest tenth of an hour, until there are 107 bacteria present?
Mathematics
1 answer:
Levart [38]3 years ago
7 0

Answer:

17.5 hours

Step-by-step explanation:

107 = 60(2^n)

n(lg2) = lg(107/60)

n = 0.8345763908 × 21

n = 17.52610421 hours

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Step-by-step explanation:

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(43.96)(r²) = 4,396

3. Solve

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If a number is divisible by 4, is it also divisible by 8?
a_sh-v [17]

Answer:

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Step-by-step explanation:

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Shelly has a gift card for her favorite restaurant for $15.she wants to treat a group of friends to sandwiches at the restaurant
elena-14-01-66 [18.8K]

Answer:

The equation for that models the total money and sandwiches bought is $ 15 =  X × $4.50 , And The value of X is 3.33

Step-by-step explanation:

Given as :

The total value of gift card = $ 15

The cost of each sandwiches = $4.50

Let The number of sandwiches bought = X

So, According to question

The total value of gift card = cost of each sandwiches × number of sandwiches bought

Or, The total value of gift card = X × $4.50

Or,  $ 15 =  X × $4.50

∴       X = \frac{15}{4.50}

I.e     X = 3.33  

Hence The equation for that models the total money and sandwiches bought is $ 15 =  X × $4.50 , And The value of X is 3.33   Answer

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4 years ago
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