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Leno4ka [110]
3 years ago
13

How do you find the power of 13 in your head

Mathematics
1 answer:
Vikentia [17]3 years ago
3 0

You memorize it. Or you could do 13 times 3 and add 130

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taurus [48]
The square root of 9 is 3
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3 years ago
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20% of 57 is what number ?<br> The proportion is ?
Elanso [62]

Answer:

11.4

20/100 = x/57

Step-by-step explanation:

It is perhaps simplest just to translate the given English sentence into a mathematical sentence.

... 20% ... ... of ... 57 ... is ... what number

... 20/100 ... × ... 57 .... = ... what number . . . . . . . . translation to math sentence

... 11.4 = what number . . . . . . . . carry out the multiplication

_____

If you're asked to write this as a proportion, you can write it like this:

\dfrac{20}{100}=\dfrac{\text{what number}}{57}

You can solve this proportion by multiplying by 57 (the denominator under "what number"). Doing so gives you the same arithmetic sentence as shown above.

6 0
3 years ago
Use the​ power-reducing formulas to rewrite the expression as an equivalent expression that does not contain powers of trigonome
jolli1 [7]

Answer:

Answer is attached

8 0
3 years ago
A man bought 42 stamps, some 13¢ and some 18¢. How many of each kind did he buy if the cost was $6.66?
OverLord2011 [107]
Let's call the 13¢ stamps a and the 18¢ stamps b: a+b = 42 and therefore a= 42-b (formula 1) 0.13a+0.18b= 6.66 In this formula, substitute the value of a according to formula 1: 0.13(42-b)+0.18b= 6.66 Multiply on the left to get rid of the parenthesis: 5.46-0.13b+0.18b= 6.66 Subtract 5.46 from both sides: -0.13b+0.18b= 1.20 Add on the left: 0.05b= 1.20 Divide both sides by 0.05 b= 24 You have 24 18¢ stamps and: 42-24= 18 13¢ stamps Check: (24 x 0.18) + (18 x 0.13)= 6.66 Correct.
5 0
3 years ago
The amoebas on a petri dish is doubling every 5 minutes. If there are currently 8 amoebas on the dish, how many will there be in
pychu [463]

Answer:

32,768.

Step-by-step explanation:

There are 12 lots of 5 minutes in 1 hour.

The equation  is 8*(2^12)

= 8 * 4096

= 32,768.

3 0
3 years ago
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