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valentina_108 [34]
3 years ago
13

Use the commutative property to identify which expression is equal to (3+4) x9

Mathematics
1 answer:
irinina [24]3 years ago
4 0
The correct answer is A) 9x(3+4)
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A population of insects increases at a rate of 1.5% per day. About how long will it take the population to double?
never [62]

The <em><u>correct answer</u></em> is:

46.6 days

Explanation:

The general form for exponential growth is

A=p(1+r)^t, where A is the total amount, p is the initial amount, r is the percent of growth, and t is the amount of time (in this case, days).

We do not know the initial amount, the total amount, or the amount of time.  We do know that r, the percent of growth, is 1.5%; 1.5% = 1.5/100 = 0.015:

A=p(1+0.015)^t

We also know we want the total amount, A, to be twice that of the initial amount, p:

2p = p(1+0.015)^t&#10;\\&#10;2p=p(1.015)^t

Divide both sides by p:

\frac{2p}{p}=\frac{p(1.015)^t}{p}&#10;\\&#10;\\ 2=1.015^t

Using logarithms to solve this,

\log_{1.015}(2)=t&#10;\\&#10;\\46.6=t

8 0
3 years ago
Read 2 more answers
2 is a solution for <br><br> True or False
Vsevolod [243]

Answer:

False

Step-by-step explanation:

The open circle means you should not include the number it is on.

The inequality would look like, x<2 and not equal to. Therefore, 2 is not a solution.

3 0
3 years ago
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Hy it
Over [174]

Answer:

-4

Step-by-step explanation:

i just did it..

7 0
3 years ago
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Math question screen shot down below
ser-zykov [4K]

Answer:

11

Step-by-step explanation:

11,16,12,7,23,9,5,5

arrange to least to greatest

5,5,7,9,11 ,12,16,23

2 middle numbers

11+12= 23

23÷2= 11.5

Median is 11

3 0
3 years ago
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Paul needs 40 pounds of 48% silver alloy to finish a collection of jewelry. How many pounds each of 45% silver alloy and 60% sil
Salsk061 [2.6K]
<span>Equation:
silver + silver = silver
0.45x + 0.60(40-x) = 0.48*40
----------------
45x + 60*40 - 60x = 48*40

--------
-15x = -12*40
x = (4/5)40
x = 32 lbs (amt of 45% slloy needed)
40-x = 8 lbs (amt of 60% alloy needed)</span>
8 0
3 years ago
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