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3 years ago

What is the value of f^-1(21)

Mathematics

1 answer:

elixir [45]3 years ago

3 0

Given that f(x) = 2x + 11: if f(x) = y = 21, then 21 = 2x + 11, and so 10=2x and x=5.

Thus, f(5) = 2(5) + 11 = 21; (5,21) is a point on the graph of f(x).

If that is so (which it is), then (21,5) is a point on the graph of the inverse function, and 5 is the appropriate output value.

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Please Simplify the expression 15 + 3 - 2(2 - 1) Thanks in advance!

liberstina [14]

So my take on this
15 + 3 -2(2 - 1)
15 + 3 -2(1)
15 +3 -2
18 - 2 = 16

8 0

3 years ago

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MAVERICK [17]

Answer:

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3 years ago

Rashid [163]

Answer:

16.28%

Step-by-step explanation:

50 - 43

------------- x 100% = 16.2790697674%

Step 1.

You have to divide (50-43)/43

Step 2.

Multiply your answer to 'step 1' by 100%

Step 3.

Sometimes your teacher will tell you to round your answer, so that is your last step.

Percent increase formula:

$\frac{new value - original value}{original value} * 100percent$

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3 years ago

A mining company estimates that the marginal cost of extracting x tons of copper ore from a mine is 0.6 + 0.008x, measured in th

Serhud [2]

Answer:

The cost of extracting the first 50 tons of copper is $151,000.

Step-by-step explanation:

Start-up costs of $150,000.

For the 50 tons of cooper.

$C(x) = 0.6 + 0.008x$

$C(50) = 0.6 + 0.008*50 = 1$

1 thousand dollars.

$150,000 + $1,000 = $151,000

The cost of extracting the first 50 tons of copper is $151,000.

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3 years ago

Select all the expressions that are equivalent to the polynomial below.

katrin2010 [14]

The answers are: D and C and A and E
because:

B 3(x - 5) - 2(6x2 + 9x + 5)=−12x^2−15x−25

F (4x2 - 13x - 7) - (16x2 + 9x - 5)=−12x2−22x−2

E (-15x2 + 9x - 10) + (3x2 - 10x - 5)=−12x^2−x−15

4 0

4 years ago

Read 2 more answers