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3 years ago

Solve the system of equations using substitution. -4x-8y=40 y=-4

1 answer:

4 0

X + y = 40

y = 9x

x + 9x = 40 (substitute 9x for y in 1st equation)

10 x = 40
x = 4

4 + y = 40 (substitute 4 for x in 1st equation)
y = 36

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Summary information on the heights of 64 bass and 42 tenor singers, all men, in the New York Choral Society is given. The vocal

aleksley [76]

Answer:

Hello your question has some missing information below is the missing information

Sample mean and Sample standard deviation

Bass 70.99 and 2.52

Tenor 69.41 and 2.79

answer : <em>We will reject H0 </em>

Step-by-step explanation:

<u>Determine whether the population mean height of bass singers > population mean height of tenor singers </u>

n1 = 64 , n2 = 42

x1 ( mean ) = 70.99

x2( mean ) = 69.41

S1 ( std 1 ) = 2.52

S2 ( std 2 ) = 2.79

We will perform a two tailed test hence we will state the null and alternate hypothesis

H0 : μ1 > μ2

H1 : μ1 < μ2

significance level = 0.01

next calculate the test statistic

t = 2.96

attached below is the remaining part of the detailed solution

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3 years ago

Median of 67, 76, 76, 84, 87, 93

olga2289 [7]

$\huge\boxed{80}$

The median is the middle number when the numbers are in ascending or descending order.

In this case, the numbers are already in ascending order.

There is an even number of numbers, so we need to find the two middle numbers.

$76, 84$

Now, find the average of these numbers by adding them together and dividing them by $2$ , which is the number of values.

$\frac{76+84}{2}=\frac{160}{2}=\boxed{80}$

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atroni [7]

My answer was 56/27. Here is the work I did.

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Which of the following statements best describes the location of -(-1) on a number line?

Novosadov [1.4K]

Answer:

Step-by-step explanation:

-(-1) is 1 because if you multiply by a negative number becomes positive

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4vir4ik [10]

Answer:

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Step-by-step explanation:

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4 years ago

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