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Snezhnost [94]
3 years ago
9

A virus is spreading exponentially. The initial amount of people infected is 40 and it is increasing at a rate of 5% per day. Ho

w many people will be infected with the virus after 12 days? Round to the nearest whole number Enter your answer in the box.

Mathematics
2 answers:
svetlana [45]3 years ago
7 0
100\%+5\%=105\%=1.05\\\\\#0-40\\\#1-40\cdot1.05=42\\\#2-40\cdot1.05\cdot1.05=40\cdot1.05^2=44.1\\\#3-40\cdot1.05\cdot1.05\cdot1.05=40\cdot1.05^3=46.305\\\vdots\\\text{therefore}\\\#12-40\cdot1.05^{12}\approx71.834\approx72\\\\\text{Answer:}\ 72
marysya [2.9K]3 years ago
5 0

Hello,

40*1.05^{12}=71.83425\approx{72}
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Wich expression is equivalent to (3x^5+8x^3)-(7x^2-6x^3)
n200080 [17]
(3x^5 + 8x^3) - (7x^2 - 6x^3) = 3x^5 + 8x^3 - 7x^2 - 6x^3 = 3x^5 + 2x^3 - 7x^2
6 0
3 years ago
Given f(x) = 7x^9, find f^-1 (x). Then state whether f^-1 (x) is a function
Olin [163]
A though without graphing software it would appear to be C


Step-by-step explanation:
The inverse of a function is the function reflected across the line y=x. This results in the coordinate points (x,y) of the function becoming (y,x) for the inverse function. Algebraically to find the inverse, switch the x and y locations and solve for y.
y = 7x^9
x = 7y^9
x/7 = y^9
(9)√(x/7) = y
This is a ninth root of (x/7) also written in exponents as y = (x/7)^(1/9).
This is a function. While it appears not to be a function because the middle portion over the origin appears vertical, it is a function because the middle portion over the origin is changing and graphing software shows it has no input with more than one output. Without graphing software you would rule it is not a function.
7 0
3 years ago
If f(x) = 3x – 4, what is f(x) when x = 8?
Delicious77 [7]

Answer:

3(8)-4= 24-4= 20 your answer is 20

Step-by-step explanation:

6 0
3 years ago
F(x) = 3x^2 +12x+7 in standard form
ivann1987 [24]

Answer:

y = ax^2 + bx + c  =>  F(x) = 3x^2 +12x+7;   F(x) = 3x^2 +12x+7 is already in standard form for the equation of a parabola.

Step-by-step explanation:

Actually, F(x) = 3x^2 +12x+7 is already in standard form, y = ax^2 + bx + c.  Double check the instructions for this problem.  Did you perhaps want "vertex form?"


7 0
2 years ago
Whats the area? thanks!
AlladinOne [14]
The area is 279. You do 11×19 to get the bottom portion. That will give you 209. Then for the top subtract 11 from 18 to get that side length and then do 7×10. With that you will get 70 and then you add 209 to that. 209+70=279.
8 0
3 years ago
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