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4 years ago

If An=An−1 + 4 and A5 = 12, what is A7?

Mathematics

1 answer:

dangina [55]4 years ago

3 0

Answer:

The frequency of A7, which is two octaves above A5, is 3520 (880 x 2 x 2) Hz. The octave term is used in the musical composition to relate the same notes in the higher or lower scale of notes. The note in the one octave higher scale have a doubled frequency than in the neutral scale and The note in the one octave lower scale have a half frequency than in the neutral scale.

Step-by-step explanation:

MARK BRAINLIEST PLEASE!!!!!!!

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Determine whether quantities vary directly or inversely and find the constant of variation. 16 factory workers made 40 pieces in

Andrei [34K]

Answer:

Part A) $8\ workers$

Part B) $10\ workers$

Part C) $40\ workers$

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form $k=\frac{y}{x}$ or $y=kx$

Let

x -----> the number of workers

y ----> the number of pieces made

In this problem

The relation between the variables x and y represent a direct variation (proportional variation)

For x=16, y=40

Find the value of the constant of proportionality k

$k=\frac{y}{x}$

substitute the values

$k=\frac{y}{x}$

$k=\frac{40}{16}\\k=2.5\ \frac{pieces}{worker}$

The linear equation is equal to

$y=2.5x$

Part A) How many workers are needed to make 20 pieces

For y=20 pieces

substitute in the linear equation

$20=2.5x$

$x=8\ workers$

Part B) How many workers are needed to make 25 pieces

For y=25 pieces

substitute in the linear equation

$25=2.5x$

$x=10\ workers$

Part C) How many workers are needed to make 100 pieces

For y=100 pieces

substitute in the linear equation

$100=2.5x$

$x=40\ workers$

3 0

3 years ago

HELP...

weeeeeb [17]

1. 4x + 2y = 11

x - 2 = -2y

First I would isolate one of the variables (x or y) of one of the equations, and then substitute it into the other equation.

The easiest to isolate is the "x" in the second equation

x - 2 = -2y Add 2 on both sides

x = -2y + 2

Substitute this into the first equation

4x + 2y = 11

4(-2y + 2) + 2y = 11 Multiply 4 into (-2y + 2)

-8y + 8 + 2y = 11 Combine like terms

-6y + 8 = 11 Subtract 8 on both sides

-6y = 3 Divide -6 on both sides

y = -3/6 Simplify

y = -1/2

Now that you know "y", you can plug it into either of the original equations to find "x"

x - 2 = -2y

x - 2 = -2(-1/2)

x - 2 = 1 Add 2 on both sides

x = 3

Answer is A

2. y = 3x + 5

4x - y = 5

Substitute the first equation into the second equation

4x - y = 5

4x - (3x + 5) = 5 Multiply/distribute the - into (3x + 5)

4x - 3x - 5 = 5 Combine like terms

x - 5 = 5 Add 5 on both sides

x = 10

Plug in "x" into either of the original equations to find "y"

y = 3x + 5

y = 3(10) + 5

y = 30 + 5

y = 35

Answer is A

8 0

3 years ago

Read 2 more answers

How many edges and vertices does a prism with a 50 sided end face have

Svet_ta [14]

Each with 220 sides,meaning 440 edges on the end

8 0

3 years ago

I need help plz answer fast

Ksivusya [100]

Answer:

Reflecting a point across the y-axis -> changes the sign of the x-coordinate

Reflecting a point across both axes -> changes the sign of both coordinates

Reflecting a point across the x-axis -> changes the sign of the y-coordinate

Step-by-step explanation:

Reflections:

The rule to reflect a point across the y-axis is (-x, y), meaning that the x-coordinate's sign changes.
Reflecting a point across both axes is the same thing as rotating it 180 degrees, so the rule is (-x, -y). This means that both coordinates' signs change.
Reflecting a point across the x-axis is (x, -y), meaning that the y-coordinate's sign changes.

4 0

2 years ago

Is the function represented by the table linear?

Gnom [1K]

Answer:

yes, because it does not have a constant rate of change

6 0

3 years ago