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riadik2000 [5.3K]
2 years ago
11

What does it mean use doubles to find the sum 7+8.

Mathematics
2 answers:
fredd [130]2 years ago
7 0
Find what 7 + 7 = 14. Then plus 1 gives you 15 Hope it is right
Zina [86]2 years ago
5 0
Find a number times 2 and put in the numeric sentence. Sorry if it's wrong!
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A scientist running an experiment starts with 100 bacteria cells. These bacteria double their population every 15 hours. Find ho
IRISSAK [1]
<h2>Hello!</h2>

The answer is: 23.77 hours

<h2>Why?</h2>

Total(t)=Start*2^\frac{t}{15}

Where:

Total(t) is equal to the amount for a determined time (in hours)

<em>Start</em> is the original amount

<em>t </em>is the time in hours.

For example, it's known from the statement that the bacteria double their population every 15 hours, so it can be written like this:

Total(15)=100*2^\frac{15}{15}=100*2^{1}=100*2=200

To calculate how long it takes for the bacteria cells to increase to 300, we should do the following calculation:

300=100*2^{\frac{t}{15} } } \\\frac{300}{100}=2^{\frac{t}{15} } }\\log(3)=log(2^{\frac{t}{15} })\\\\\\log(3)=\frac{t}{15}*log2\\t=\frac{log(3)}{log(2)} *15=23.77

So, to know if we are right, let's replace 23.77 h in the equation:

Total(t)=100*2^\frac{23.77}{15}=299.94

and 299.94≅300

Have a nice day!

8 0
3 years ago
Read 2 more answers
Question 15 of 24
deff fn [24]

<u><em>Answer: B. m=-23 and -23=m. *The answer should be the negative sign.*</em></u>

Step-by-step explanation:

addition property of equality is adding the same number to both sides of an equation does not change the equation.

a+c=b+c

add by 10 both sides of equation.

m-10+10=-33+10

simplify.

33-10=23

23+10=33

33-23=10

m=-23

It changes positive to negative.

Hope this helps!

Thanks!

Have a great day!

8 0
3 years ago
Question 4 pleasee help me
Rufina [12.5K]

Answer:The third one 5n(4m-3)

Step-by-step explanation: easy

7 0
3 years ago
Triangle STU has reflected over line m to form Triangle S'T'U'. What is the value of y?
Lera25 [3.4K]

Answer:

  D.  5

Step-by-step explanation:

The congruence of S'T' with ST tells you ...

  9 = x +7

  2 = x

The congruence of S'U' and SU tells you ...

  4x = y +3

  4·2 -3 = y = 5 . . . . substitute the value of x; subtract 3

3 0
3 years ago
What is 3 and 1 over 4 - 1 and 1 over 2
vampirchik [111]
Are you add or subtracting
SUBTRACTION
3 1/4- 1 1/4 = 1 3/4
Addition
3 1/4-1 1/4= 4 3/4
3 0
3 years ago
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