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evablogger [386]
3 years ago
15

Solve.

Mathematics
2 answers:
Art [367]3 years ago
4 0

Answer:

5q^2 = 405

q^2 = 81

q = 9, -9

Step-by-step explanation:

12345 [234]3 years ago
3 0

Answer:

{–9, 9}

Step-by-step explanation:

5q² + 20 = 425

5q² = 405

q² = 81

q = 9, -9

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In a normal distribution, 51 is the score that is two standard deviations above the mean, and 36 is the score one standard devia
Studentka2010 [4]

Answer:

The mean is 41

Step-by-step explanation:

Here , we are interested in finding the mean.

Firstly, let the standard deviation be x and the mean be y.

We are told that 51 is 2 standard deviations above the mean. What this mean is that if we subtract 2 standard deviations from 51, we will arrive at the mean.

Mathematically;

51 - 2(x) = y

y + 2x = 51 •••••••••(i)

We are also told that 36 is one standard deviation below the mean. What this mean is that if we subtract one standard deviation from the mean, we will have 36

Mathematically, that would be;

y-36 = x •••••••(ii)

Substitute ii into i directly;

We have

y + 2(y-36) = 51

y + 2y -72 = 51

3y -72 = 51

3y = 51 + 72

3y = 123

y = 123/3

y = 41

7 0
4 years ago
Use the Distributive Property to find<br> (y+6)(y + 4) = 0
Artemon [7]

Answer:

y=-6,\:y=-4

Hope it helps :)

3 0
4 years ago
Read 2 more answers
1-3+30<br><br> Will give branliest to first answer
Mkey [24]

Answer:

28

Step-by-step explanation:

1 - 3 + 30

= -2 + 30

= 28

4 0
3 years ago
Can someone give me the workings out for this one please
Elza [17]
50mph, 60 minutes, half both 25 and 30
A-B should be 30 minutes
B-C should probably be 20-25 personally I'd go with 25
so 55?
5 0
4 years ago
Please help i don’t know the middle one
Gnom [1K]

Answer:

Step-by-step explanation:

A new study suggests that waiting at least an hour after dinner before going to sleep reduces your risk of stroke by about two-thirds.

And for every 20 minutes more that you wait, stroke risk drops another 10%, says researcher Cristina-Maria Kastorini, MSc, a nutritionist at the University of Ioannina Medical School in Greece.

The study does not prove cause and effect -- only that there seems to be an association between waiting an hour or more between dinner and bedtime and reduced stroke risk.

Results of the 1,000-patient study were presented here at the European Society of Cardiology Congress 2011.

5 0
3 years ago
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