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3 years ago

K(a)= 4a-4, Find k(-9)

Mathematics

1 answer:

FromTheMoon [43]3 years ago

5 0

We simply replace a with -9

k(-9) = 4 * -9 - 4

k(-9) = -40

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Which exponential function goes through the points (1, 16) and (4, 128)?

djyliett [7]

Answer:

Here is the complete question (attachment).

The function which represent the given points are $f(x)=8(2)^{x}$

Step-by-step explanation:

We know that a general exponential function is like, $y=a(b)^{x}$

We can find the answer by hit and trial method by plugging the values of $(x,y)$ coordinates.

Here we are going to solve this with the above general formula.

So as the points are $(1,16)$ then for $x=1,\ y=16$

Can be arranged in terms of the general equation.

$ab^1=16$ ...equation(1) and $ab^4=128$ ...equation(2)

$a\times b=16, then\ a=\frac{16}{a}$

Plugging the values in equation 2.

We have

$\frac{16}{b} b^4=128,16\times b^3=128,b=\sqrt[3]{\frac{128}{16}} =\sqrt[3]{8}=2$

Plugging $b=2$ in equation 1.

We have $a=\frac{16}{b} =\frac{16}{2} =8$

Comparing with the general equation of exponential $a=8$ and $b=2$

So the function which depicts the above points = $y=8(2)^x$

From theoption we have B as the correct answer.

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4 years ago

The length of the longer leg of a right triangle is 13 m more than three times the length of the shorter leg. The length of the

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Answer:17

Step-by-step explanation:

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say you have a triangle that is 4,4,8

4 is a

4 is b

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The correct answer is 20.7 inches of snow

Explanation:

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F(x) = 6x + 7; x = -3

jok3333 [9.3K]

Answer:

1+80×70-80+55-6+12065

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