MATHEMATICS MIDDLE SCHOOL

Which exponential function goes through the points (1,8) and (4,64)?A) f(x)=4(2)^x

B) f(x)=2(4)^x

C) f(x)=4(2)^-x

D) f(x)=2(4)-x

Answers

Answer 1
Answer: Plug in (4,64) into each answer choice.

A) 4(2)^x
64 =4(2)^4 
64 = 4(16) 
64 = 64

Answer choice A is correct.

B) f(x) = 2(4)^x
64 = 2(4)^4
64 = 2(256)
64 ≠ 512

Answer choice B is incorrect.

C) f(x) = 4(2)^{-x}
64 = 4(2)^{-4}
64 = 4(-0.0625)
64 ≠ 0.25

Answer choice C is incorrect.

D) f(x) = 2(4)^{-x}
64 = 2(4)^{-4}
64 = 2(0.00390625)
64 ≠ 0.0078125

Answer choice D is incorrect.


Your answer is B) f(x)=2(4)^x

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Find the difference of 5063 and 3987 to the nearest thousand

1-2+3-4+5-6+..+99-100.

Answers

-50

So you want to pair them up
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And write the answer for each pair
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Answers

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I just need the extraneous root

Answers

Answer:

Step-by-step explanation:

2+√(2x-3) =√(x+7) ~~~(1)\n x \ge -7\nand ~x\ge (3)/(2) \nsquaring ~(1)\n4+2x-3+4√(2x-3) =x+7\n4√(2x-3) =x+7-2x-4+3\n4√(2x-1) =-x+6\nsquaring\n16(2x-3)=x^2-12x+36\n32x-48=x^2-12x+36\nx^2-12x-32x+36+48=0\nx^2-44x+84=0\n\nx^2-2x-42x+84=0\nx(x-2)-42(x-2)=0\n(x-2)(x-42)=0\nx=2,42\nx=2 is a solution.\nwhereas ~x=42 ~is~an~extraneous ~root.\nas~2+√(2*42-3) =√(42+7) \n2+√(81) =√(49) \n2+9=7\nor 11=7\nwhich~is~not~true.

I need help Idk which one Is the answer

Answers

the answer is b to this problem !!

Answer:

C is the answer...hope this helps!

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Answers


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A bacteria culture begins with 4 bacteria which double in size every hour. How many bacteria exist in the culture after 8 hours?128
256
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Answers

4 Bacteria double per hour to give 8 bacteria then in 8 hours it will become 64 then this 64 doubles to give us 128

Let me make it clear,


The bacteria culture begins with 4 bacteria and double up every hour. And the hours given is 8 hours.

Therefore, we can first list the equation: 4 x 2^8

And we can get the solution 1024 <- Answer


Hope it helps
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