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3 years ago

A small bird uses 5^-4 Joules of energy to sing a song. Write the amount of energy as a decimal.

Mathematics

1 answer:

const2013 [10]3 years ago

7 0

The answer is c.
We just have to apply the law of exponents:
$=\frac{1}{5^4}$
That´s equal to:
$=\frac{1}{625}=0,0016$

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If a line crosses the y-axis at (0, -4) and has a slope of -2, what is the equation of the line

padilas [110]

-2x-4

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2 years ago

A survey study is to be made to estimate the proportion of residents of a certain suburb who favor the construction of a public

lesya [120]

Answer: 601

Step-by-step explanation:

When the prior estimate of population proportion is not given , the formula we apply to find sample size :

$n=0.25(\dfrac{z^*}{E})^2$

, where z* = critical z-value

E=Margin of error

Given : Margin of error = 0.04

Confidence level = 95%

We know that , according to the z-table , the critical value for 95% confidence interval = z*= 1.960

Then, the required sample size : $n=0.25(\dfrac{1.960}{0.04})^2$

$n=0.25(49)^2$

$n=0.25(2401)=600.25\approx601$

Hence, the required minimum sample size = 601

4 0

3 years ago

What is 7.3 as a fraction

Snezhnost [94]

To write 7.3 as a fraction you have to write 7.3 as numerator and put 1 as the denominator. Now you multiply numerator and denominator by 10 as long as you get in numerator the whole number.
7.3 = 7.3/1 = 73/10

And finally we have:
7.3 as a fraction equals 73/10

7 0

3 years ago

The center of a circle is at (−5, 2) and its radius is 7. What is the equation of the circle?

Rainbow [258]

Answer:

(X+5)^2 + (Y-2)^2 =49

Step-by-step explanation:

Equation of the circle

(X-a)^2+(Y-b)^2= r^2

Center=(-5 ; 2) , so : a= -5 y b=2

y r=7

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3 years ago

The school library has 2,986 books on it each shelf has 48 books on it shelves are in the library

Gala2k [10]

Answer:

63 shelves

Step-by-step explanation:

2986 ÷ 48 = 62. 03

ans = 63

3 0

2 years ago