A variable star is one whose brightness alternately increases and decreases. For one such star, the time between periods of maximum brightness is 4.5 days, the average brightness (or magnitude) of the star is 5.4, and its brightness varies by ±0.30 magnitude. Find a function that models the brightness of the star as a function of time (in days), t. (Assume that at t = 0 the brightness of the star is 5.4 and that it is increasing.)
Answers
Answer:
f(t) = 5.4 + 0.3sin (2π/4.5t)
Step-by-step explanation:
See attachment
Related Questions
A basketball player scored 30 times during one game. she scored total of 50 points, two for each two point shot and one for each free throw. How many two point shots did she make? How many free throws
Answers
Answer:
it is 20
Step-by-step explanation:
Answer:
20
Step-by-step explanation:
7.86÷0.2
I need you to answer with step by step explaination
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2. The equation became 78.6/2
3. Divided 7/2, got 3
4. Divided 8/2, got 9
5. Put the decimal point on the preferred spot
6. Divide 6/2, got 3
7. 78.6/2 equals 39.3
True or False: The Sine Function, y=sin(2), has a Horizontal Asymptote.
True
O False
Answers
Answer:
true
Step-by-step explanation:
1m-23=1+4m Please help
Answers
Answer:
m= -8
Step-by-step explanation:
Answer:
m=-8
Step-by-step explanation:
Hope this helps :)
The length of a rectangle is three times its width. if the perimeter of the rectangle is 48 yd, find its area.
Answers
Answer:
all the sides multiplies should equal 48
Step-by-step explanation:
sorry I don't know
The rectangle will have a 432 yd² area.
What is Area?The area is the entire amount of space occupied by a flat (2-D) surface or an object's form. On a sheet of paper, draw a square using a pencil. It has two dimensions. The area of a form on paper is the area that it occupies.
Given, The length of a rectangle is three times its width. if the perimeter of the rectangle is 48 yd
Let "l " be the length of the rectangle
thus, the width of the rectangle = l/3
Since the Perimeter of the rectangle = 48 yd
From the general formula of the Perimeter of the rectangle:
perimeter = 2*(length + width)
In our case
Perimeter = 2*( l + l/3)
Perimeter = 2*(2l/3)
Perimeter = 4L/3
Thus,
4L/3 = 48
L = 36 yd
So width = 36 /3 = 12
Since the area of the rectangle = length * width
Area = 12 * 36
Area = 432
therefore, the area of the rectangle will be 432 yd².
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eight children share two pies equally. how many pies will each child get?
Answers
Answer:
Each child will get 1/4 of a pie
Step-by-step explanation:
decrease of 65% is the same as multiplying by what
percent?
Answers
Answer:
35%
Step-by-step explanation:
A decrease of 65% would be the same as multiplying the value by 35%.
100% - 65% = 35%
Let's use an example.
You have $150 dollars in stock and it decreases by 65%
150 - (.65*150) =
150 - 97.5 = $52.50
Now let's just multiply $150 by .35 (which is 35%)
150 * .35 = $52.50
It's the same!
What is the value of the 7in the following number? 2,104.47
Answers
Answer:
7 hundredth is the value of 7 in the question
Nine friends vote on their favorite fruit. Only one person in the group votes for kiwi.
Choose the decimal that is equivalent to this fraction.
A. 0.1
B. 0.11
C. 0.111111…
D. 0.212121…
Answers
Answer:
i think it would be A
Step-by-step explanation:
Jonas has 20 coins, all nickels and dimes. The total value is $1.25. If n represents the number of nickels, which algebraic equation represents this situation?
A. 20n = 125
B. 5n = 1.25
C. 5n + 10(20 - n) = 125
D. 5n + 10n - 20 = 125
Answers
Answer:
a
Step-by-step explanation:
The average price of a movie ticket in the United States from 1980 to 2000 can be modeled by the expression 2.75+0.10x, where x is the number of years since 1980.
Which part of the expression corresponds to the cost of movie tickets in 1980?
Answers
Answer:
2.75
Step-by-step explanation:
0.10 represents the rate at which prices have increased since 1980..
2.75 represents the price in 1980
This can be confirmed by inputting 0 as the value of x.
2.75+0.10(0) = 2.75
If a = 7 and b=2 what is (a-b)²
Answers
Answer:
25
Step-by-step explanation:
[tex](7 - 2) { }^{2} [/tex]
[tex] = 5 { }^{2} [/tex]
[tex] = 25[/tex]
Two dice are tossed. The probability that the total score is a prime number is:
Answers
Step-by-step explanation:
50/50 it's random I think but I learned that in science
The length of a rectangle is 2 less than two times the width. Perimeter is 42. Find the length and the width.
Answers
Answer:
Hi there
Your answer is
width= 5.75
length= 9.5
Step-by-step explanation:
L=2w-2
P=42
Perimeter formula
L+L+W+W=P
(2w-2)+(2w-2)+w+w=42
8w-4=42
+4
8w=46
/8
w= 5.75
Plug in width in length formula!
L=2w-2
L=2(5.75)-2
L=9.5
Answer all ten questions for tons of points. Please don’t take forever
Answers
Answer:
Hey looks like you did'nt post the question
msg me below and ill try to help you
HELLLLLLLLPPPPPPPPPPPP!!!!!!
Answers
Answer:
3 bars of soap and 2 toothbrushes.
Step-by-step explanation:
Helllllllllllllp meeeeeeee I’m an idiotttttt
Answers
Answer:
3(4 + 3x)
distribute the 3 into both numbers
3*4
3*3x
9x +12
Step-by-step explanation:
Ummm this is prolly the last time tehe
Answers
Answer:
1. 25% increase
2. 90% decrease well you get 8.4 but that's the closest
3. 71% increase
4. 20% decrease
5. 75% decrease
6. 150% increase
Step-by-step explanation:
What is 837 divided by 36?
Answers
Answer:
23.25 you will just divide it
Step-by-step explanation:
Jack and Jillian sell apples at a produce stand. Jillian earns $2 for each bag of apples she sells. At the end of the week, Jack has earned $8 less than Jillian. The following expression shows Jack's earnings:
2x − 8
In the expression, what does the first term represent?
Answers
Answer:
2(x-4)
Step-by-step explanation:
it's the only thing i could think of, or its one
Answer:
Jillian's earnings at the end of the week
A case of tomato cans weighs 563 dekagrams. A case of soup cans weighs 458 dekagrams. How much do the two cases weigh together in decigrams? Use the metric table to help answer the question.
Metric Table
kilo- 1,000 hecto- 100 deka- 10 unit 1 deci- 0.1 centi- 0.01 milli- 0.001
o 1,021 decigrams
o 10,210 decigrams
o 102,100 decigrams
0 1,021,000 decigrams
Hurry please i need help.
Answers
Answer:
102,100 decigrams
Step-by-step explanation:
(564 dag + 458 dag) = 1021 dag
1021 dag × 100 dg/dag = 102100 dg
The two cases together weigh 102,100 decigrams.
_____
1 dag = 10 g
1 dg = 0.1 g
Answer:
102,100 decigrams.
Step-by-step explanation:
how to graph a line with slope 2 passing through the point (2, -1)
Answers
1. Lori drove 141 miles in 3 hours. What was Lori’s average rate of speed?
Answers
Answer:
47 miles per hour
Step-by-step explanation:
The average rate of speed is the miles divided by the hours
141 miles / 3 hours
47 miles per hour
Answer:
47
Step-by-step explanation:
141 / 3
Ada had $42 to spend on a binder and 11 spiral notebooks. The binder cost $9 what was the price of each spiral notebook?
Answers
9 + 11x = 42
subtract 9 from each side
11x = 33
divide by 11
x = 3
rounded to the nearest thousandth, the number 0.0000741
Answers
Answer:
.000
Step-by-step explanation:
Quick I need help.....
Answers
Answer:
C
Step-by-step explanation:
Subtract both sides by 2
2-2 is 0
-10 - 2 is 12
-3x < 12
Divide both sides by -3
Switch signs cause dividing a negative
x > -4
select the correct answer from each drop-down menu.
The decibel level of a normal conversation, which has an intensity of 3.2x10-6 watts/m2, is (ANSWER1) dB. If the decibel level goes up to
80, the intensity of the sound will be
(ANSWER2) watts/m2
B = 10103(t.), where is the sound level in decibels, is the intensity of sound you are measuring, and I is the
Use the formula
smallest sound intensity that can be heard by the human ear (roughly equal to 1x10-12 watts/m2).
Answers
Answer:
The intensity of sound in decibel is 65 dB
The intensity of sound in Watts/m² is 1 x 10⁻⁴ W/m²
Step-by-step explanation:
The intensity of sound in decibel is given by;
[tex]\beta (dB) = 10Log(\frac{I}{I_o})\\\\[/tex]
where;
I₀ is the smallest sound intensity that can be heard by the human ear = 1 x 10⁻¹² watts/m²
[tex]\beta (dB) = 10Log(\frac{I}{I_o})\\\\\beta (dB) = 10Log(\frac{3.2*10^{-6}}{1*10^{-12}})\\\\\beta (dB) = 65.05 \ dB[/tex]
= 65 dB
If the decibel level goes up to 80 dB, the intensity in W/m² is given by;
[tex]\beta (dB) = 10Log(\frac{I}{I_o} )\\\\80 = 10Log(\frac{I}{I_o} )\\\\8 =Log (\frac{I}{I_o} )\\\\10^8 = \frac{I}{I_o} \\\\I = I_o *10^8\\\\I = 1*10^{-12}*10^8\\\\I = 1*10^{-4} \ W/m^2[/tex]
what if f(0)?
12 only
2 and 3 only
-2,-1,1 and 2 only
-2,-1,1,2 and 12
Answers
Answer:
12 only
Step-by-step explanation:
I did the test
An ordered pair is written as:
(domain, range)
(range, domain)
Answers
Answer:
the answer is (domain, range) or (x,y)
An ordered pair is written as, (domain, range). So Option A is correct
What is Domain and Range ?The domain of a function is the set of all input values (independent variable) for which the function is defined and produces a valid output (dependent variable).
The range of a function is the set of all possible output values of the function. It represents the set of all possible values of the dependent variable.
The set of all "x" values constitutes the domain, and the set of all "y" values constitutes the range, in a set of ordered pairs.
You should keep in mind that ordered pairs are represented by the following symbols: (x, y).
Find the domain when examining a collection of ordered pairs by compiling a list of all the relation's x values.
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3x + 5 = 20 - 2x
I need sum help
Answers
Hope this helps!! <3
Answer:
18x
Step-by-step explanation: