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worty [1.4K]
3 years ago
5

As the distance of a sound wave from its source quadruples, how is the intensity changed?

Mathematics
1 answer:
natulia [17]3 years ago
5 0

Answer:

I think its b

Step-by-step explanation:

because 4×4 is 16

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Slove : 28/36 = 14/y
Dafna1 [17]

Answer:

y = 18

Step-by-step explanation:

<h3><u>i</u><u>)</u><u> </u><u>redu</u><u>ce</u><u> the</u><u> fraction</u><u> </u><u>with</u><u> </u><u>4</u></h3>

\frac{28}{36}  =  \frac{14}{y}

\frac{28 \div 4}{36 \div 4}  =  \frac{14}{y}

\frac{7}{9}  =  \frac{14}{y}

<h3><u>ii</u><u>)</u><u> </u><u>simpl</u><u>ify</u><u> the</u><u> </u><u>eq</u><u>uation</u><u> </u><u>with</u><u> </u><u>cross</u><u> </u><u>multiplication</u></h3>

\frac{7}{9}  =  \frac{14}{y}

7y = 14 \times 9

7y = 126

<h3>iii) <u>divi</u><u>de</u><u> both</u><u> sides</u><u> of</u><u> the</u><u> equation</u><u> </u><u>by</u><u> </u><u>7</u></h3>

<u>\frac{7y}{7}  =   \frac{126}{7}</u>

<u>y = 18</u>

7 0
2 years ago
Read 2 more answers
Step 1 of 3: Each year a nationally recognized publication conducts its Survey of America’s Best Graduate and Professional Schoo
lukranit [14]

Answer:

Step-by-step explanation:

Hello!

Given the variables

Y: Starting salary of a graduate at a top business school

X: GMAT score of the business school

The sample used had a size n=20

The estimated regression equation was ^Y= -92040 + 228Xi

The correlation coefficients were r= 0.81

You need to know if r is statistically significant at a 0.05 level:

Assuming the hypotheses are:

H₀: There is a linear correlation between the variables of interest

H₁: There is no linear correlation between the variables of interest

α: 0.05

This test is two-tailed.

The p-value for a r=0.81 and n=20 is 0.000015

Using the p-value approach, the decision rule is:

If p-value ≤ α, reject the null hypothesis

If p-value > α, do not reject the null hypothesis

In this case, the p-value is less than α, the decision is to reject the null hypothesis.

At a 5% level, you can conclude that the coefficient of correlation is statistically significant.

4 0
3 years ago
If the measure of DEF is 65 what is the measure of DE. PLEASE HELP FAST
Wittaler [7]

EF is tangent to the circle we'll assume; otherwise there's no progress.


Call the center C. ECD is isosceles, formed from two radii and the chord.


Angle CED is complementary to DEF


CED = 90 - 65 = 25 degrees


CDE is congruent, isosceles triangle and all that: CDE=25


That leaves DCE=180-25-25=130 degrees


That's the measure of arc DE as well:


Answer: 130 degrees, choice A




8 0
3 years ago
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Which is the best estimate for the length of a lady bug?
Effectus [21]

Answer:

The average length of a ladybug is . 3 to . 4 inches.

7 0
2 years ago
Carole purchased 7/8 of a pound of chocolate chips to make cookies. On the way home from school she got hungry and ate 1/4 of th
AURORKA [14]
Answer is below..................

4 0
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