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topjm [15]
3 years ago
5

Jason bought n candy bars. Write an expression to show the total cost of the candy bars if each candy bar cost $5.

Mathematics
2 answers:
Eva8 [605]3 years ago
6 0

Answer:

total cost of the candy bars = 5 x n

Step-by-step explanation:

Lady bird [3.3K]3 years ago
4 0

Answer:

5n

Step-by-step explanation:

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The answer is b hope you enjoy your answer
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Use the elimination method to solve the system of equations.
ExtremeBDS [4]

Answer:

Option D. (8, – 4)

Step-by-step explanation:

3x + 4y = 8 ..... (1)

x – y = 12.... (2)

To solve the above equation by elimination method, do the following:

Step 1:

Multiply equation 1 by the coefficient of x in equation 2 i.e 1.

Multiply equation 2 by the coefficient of x in equation 1 i.e 3. This is illustrated below:

1 × Equation 1

1 × (3x + 4y = 8)

3x + 4y = 8 ...... (3)

3 × Equation 2

3 × ( x – y = 12)

3x – 3y = 36......(4)

Step 2:

Subtract equation 3 from equation 4. This is illustrated below:

. 3x – 3y = 36

– (3x + 4y = 8)

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

– 7y = 28

Divide both side by the coefficient of y i.e –7

y = 28/–7

y = – 4

Step 3:

Substitute the value of y into any of the equation to obtain the value of x. In this case, we shall substitute the value of y into equation 2 as shown below:

x – y = 12

y = –4

x – (–4) = 12

x + 4 = 12

x = 12 – 4

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Therefore, the solution to the equation above is (8, – 4)

4 0
3 years ago
In general, f−1(f(x)) = f(f−1(x)) =
Anestetic [448]

Answer:

f−1(f(x)) = f(f−1(x)) = x

Step-by-step explanation:

Follow this simple example using the function f(x) = x + 2

f(x) = x + 2

NOw we find the inverse function f^(1)(x).

y = x + 2

x = y + 2

y = x - 2

f^(-1)(x) = x - 2

The inverse function is f^(-1)(x) = x - 2

Now we do the two compositions of functions:

f^(-1)(f(x)) = x + 2 - 2 = x

f(f^(-1)(x)) = x - 2 + 2 = x

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Answer: f−1(f(x)) = f(f−1(x)) = x

5 0
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Gordon bought lunch for $8.43. He paid with a $20 bill. How much change did he get back?
anzhelika [568]

Answer:

$11.57

Step-by-step explanation:

20 - 8.43 is 11.57

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Subtract 5 from both sides.

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8 0
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