I = 870pie^2a^2f^2
The intensity, I of a sound wave is defined as its power output per unit area and is measured in watts per square meter (w/m^2) A sound wave's intensity can be calculated using the above equation, where a stands for the wave's amplitude in meters (m) and f stands for its frequency of vibration in hertz (Hz). If a particular sound wave has an intensity of 0.05 w/m^2 and an amplitude of 3 x 10^-5 m, which of the following is most nearly its frequency?
a. 8.77 hertz
B
80 hertz
c.6,500 hertz
d. 4 x 107 hertz
Answer: 80 hertz
Step-by-step explanation:
What is the measure of angle ABC?
Angle ABC=___ degrees
Answer:
60°
Step-by-step explanation:
measure of angle ACB = 180-135= 45
then the required angle = 180-(45+75) = 60°
I hope that was helpful
graph of y = −4x − 1?
Answer:
Explanation: Since the equation is linear/straight in the form y=mx+c , you can determine the slope/gradient ( m ) and y-intercept ( c ). To graph this equation, you'll need to find 2 points on the line and join them together. We know one of the points is (0, 1) as the y-intercept is 1.
Step-by-step explanation:
I hope I help u!!!
12 m
10 m
What is the volume
Answer:
none
Step-by-step explanation:
1 Type the correct answer in the box. Use numerals Instead of words. Karl has two one-dollar bills, a twenty-dollar bill, three ten-dollar bills, and two five-dollar bills in his wallet, Karl has $ In his wallet.
Answer:
62
Step-by-step explanation:
2+20+30+10=62
two square are congruent ,if they have same _____
Answer:
Two squares are congruent if they have the same side length
Step-by-step explanation:
The dimensions of a square are the side length of the square and in a square, all sides are equal
Therefore, given that two quadrilaterals are squares, and the side length of each of the given quadrilateral are equal, the quadrilateral are said to be congruent.
what is 1/2 x 3/4 ????
1/2 x 3/4 = x
x =
3/8
or rather
0.375
The resultant of multiplication of fraction 1/2 x 3/4 is 3/8.
What is mathematic expression?
A mathematical expression expression in mathematical is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.
Here it is given the multiplication of fractions 1/2 x 3/4 which can be solved by multiplying 1 and 3 of numerator and placing at numerator of result and also by multiplying 2 and 4 of denominator and placing at denominator of result.
1/2 x 3/4 = (1x3)/ (2x4) = 3/8
Therefore, the resultant of multiplication of fraction 1/2 x 3/4 is 3/8.
Read more about property of multiplication here :
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Solve the system by substitution. And show your work
-9y-10=x
5x+6y=-11
Answer:
x = -1, y = -1
( -1 , -1 )
Step-by-step explanation:
plug in -9y - 10 for x
5 ( -9y - 10) + 6y = -11
-45y - 50 + 6y = -11
-39y - 50 = -11
-39y = 39
y = -1
then plug in
-9(-1) - 10 = x
9 - 10 = x
x = -1
Use point-slope form to write a linear equation to represent the growth of Claire over time. Then, simplify the equation and write it in slope-intercept form. Identify the y-intercept. Show your work.
Complete Question:
The growth of baby girl Claire is displayed in the graph below. (4, 22) (14, 30)
Answer:
Point Slope: [tex]y - 22 = 0.8(x - 4)[/tex]
Slope Intercept: [tex]y = 0.8x +18.8[/tex]
y intercept: [tex]b = 18.8[/tex]
Step-by-step explanation:
Given
[tex](x_1,y_1) = (4,22)[/tex]
[tex](x_2,y_2) = (14,30)[/tex]
Solving (a) Point slope
Using point slope form, an equation is of the form
[tex](y_2 - y_1) = m(x_2 - x_1)[/tex]
First, we need to solve for slope (m):
Make m the subject
[tex]m = \frac{y_2 - y_1}{x_2 - x_1}[/tex]
Substitute values for x and y
[tex]m = \frac{30 - 22}{14 - 4}[/tex]
[tex]m = \frac{8}{10}[/tex]
[tex]m = 0.8[/tex]
Next, we form a linear relationship
[tex]y - y_1 = m(x - x_1)[/tex]
Where
[tex]m = 0.8[/tex] and [tex](x_1,y_1) = (4,22)[/tex]
[tex]y - 22 = 0.8(x - 4)[/tex]
Solving (b): Slope Intercept
[tex]y - 22 = 0.8(x - 4)[/tex]
Open Bracket
[tex]y - 22 = 0.8x - 3.2[/tex]
Add 22 to both sides
[tex]y - 22 +22= 0.8x - 3.2 + 22[/tex]
[tex]y = 0.8x +18.8[/tex]
Solving (c): The y intercept
The general form of an equation is:
[tex]y = mx + b[/tex]
Where b represents the y intercept
By comparison with [tex]y = 0.8x +18.8[/tex]
[tex]b = 18.8[/tex]
Answer:
34 x 6.45 because if you look at the numbers then u will find this
What is the solution of this question.
9988 ÷ 23 =
Answer:
[tex]434\frac{6}{23}[/tex]
I hope this helps!
john climbed 30 steps in 12 seconds At this rate how long will it take john to climb 45 steps
Answer:
18 minutes for John to climb 45 steps.
Step-by-step explanation:
30/12 = 45/x
30x = 540
18
PLS HELP I WILL LOVE U FOREVER PLS IM DESPREATE
Answer:
The equation of the exponential function will be:
[tex]y\:=\:10\cdot \left(\frac{1}{5}\right)^x[/tex]Step-by-step explanation:
The general exponential function is defined as
y = abˣ
Here,
a is the initial value and b is the growth factorFrom the table, it is clear that the y-intercept is (0, 10). Note that the y-intercept can be determined by setting x=0 and solving for y.
here
at x=0, y=10
so a = 10
If we check the y-values, it is clear that every next value of y can be obtained by multiplying the previous y-value by 1/5.
In other words, the common multiplier = b = 1/5
Thus, the equation becomes
[tex]y\:=\:10\cdot \left(\frac{1}{5}\right)^x[/tex]
Thus, the equation of the exponential function will be:
[tex]y\:=\:10\cdot \left(\frac{1}{5}\right)^x[/tex]4.
Find the slope given the points (3,2) and (4,7).
a) 4
b) 5
c) -5
d) 1/5
I
Answer:
The slope would be 5, answer B.
You can find this by doing y2 - y1/ x2 - x1.
Hope this helps.
Step-by-step explanation:
Ben had $100 in his savings account. He adds $5.00 a week to his savings as shown in the graph below. According to this graph, how much money does he have in his savings account after 8 weeks?
A. $40
B. $135
C. $140
D. $145
Answer:
Option (C)
Step-by-step explanation:
Let the relation between amount of money (m) and Time (t) is represented by the equation,
m = ct + b
Where c = Investment per week
b = Ben already had the amount before investment
From the question,
c = $5 per week
b = $100
Therefore, equation will be,
m = 5t + 100
If duration of the investment 't' = 8 weeks
Amount in the account after 8 weeks,
m = 5(8) + 100
m = $140
Option (C) is the correct option.
Write the importance of mathematics in your education describing in your own words
Answer:
mathematics is important so you know how to solve problems. there are a lot of ways in the future you might use math. you use math in other subject too.
Step-by-step explanation:
Which choice shows the coordinates of C'if the trapezoid is reflected across the y-axis?
Evaluate -32(-2)^6/16(-2)^3
Answer:
1024
Step-by-step explanation:
Answer:
-78848
Step-by-step explanation:
Pls help ASAP!! Find the missing side using the rules for 45-45-90 and 30-60-90 right triangles
Answer:
oops this isn't the answer but hey L homie lol swaggy anyways lemme try and help
Carlos can type 228 words in 4 minutes. Which equation represents the number of words Carlos can type per minute?
Answer:
words per minute = 228/4
Carlos can type 57 words per minute.
Step-by-step explanation:
A painter used 1 1/2 gallons of paint to paint 3/4 of a room. At this same rate, how many gallons will it take to paint the whole room?
Please show your work with descriptions, this topic of math is really confusing for me.
Answer:
Convert to decimals:
1.5 and 0.75
Then, set up a proportion
1.5/0.75=x/1
proportion x/y=x/y
since the 3/4 and 1 are the same topic ( the room) we put them together.
Solve: 1.5/0.75=x
x=2
So 2 gallons
Hope this helps plz hit the crown :D
Which expressions can be used to find m∠ABC? Select two options. cos−1(StartFraction 9.8 Over 6.3 EndFraction) cos−1StartFraction 6.3 Over 9.8 EndFraction) cos−1(StartFraction 7.5 Over 9.8 EndFraction) sin−1(StartFraction 9.8 Over 7.5 EndFraction) sin−1(StartFraction 7.5 Over 9.8 EndFraction)
Answer:
B. [tex]Cos ^{-1}[/tex] [tex]\frac{6.3}{9.8}[/tex]
E. [tex]Sin^{-1}[/tex] [tex]\frac{7.5}{9.8}[/tex]
Step-by-step explanation:
The trigonometric functions are applied when given a side and one of the angles of a right angled triangle.
Sine θ = [tex]\frac{opposite}{hypotenuse}[/tex]
Cosine θ = [tex]\frac{adjacent}{hypotenuse}[/tex]
Tangent θ = [tex]\frac{opposite}{adjacent}[/tex]
Given that; hypotenuse = 9.8, opposite side = 7.5 and adjacent side = 6.3.
Then,
Sin θ = [tex]\frac{7.5}{9.8}[/tex]
⇒ θ = [tex]Sin^{-1}[/tex] [tex]\frac{7.5}{9.8}[/tex]
Also,
Cos θ = [tex]\frac{6.3}{9.8}[/tex]
⇒ θ = [tex]Cos ^{-1}[/tex] [tex]\frac{6.3}{9.8}[/tex]
So, the appropriate answers to the given questions are options B and E.
Answer:
b
Step-by-step explanation:
Is the following relation a function?
Yes
No
Answer:
Step-by-step explanation:
no
HELP WITH 4,5 AND 6 PLZZ
Answer:
4) divide, 5) multiply, 5) divide
Step-by-step explanation:
4) you need to divide to determine the length each individual ribbon will be
5) you need to multiply the price of one shirt by three to find the price of three shirts
6) you need to divide the amount of dog food the dog will eat each day by the amount of dog food to see how many days the food will last.
What does "practical domain" mean?
Question 2 options:
the x values
the y values
the x values that make sense in context of the problem
the y values that make sense in context of the problem
Answer:
C
Step-by-step explanation:
The domain is x value but practical domain is "c".
I took the test too. :)
Please give me brainliest
Which of the following is the best definition for the word "proportion"
an average combined value of numbers in a data set
an equation stating that two ratios are equivalent
a relationship between quantities
a number that describes the direction and steepness of a line
PLS HELP
Answer:
The. second one i think because proportion is amount to somthing elese
EASY! PLEASE HELP. HIGH POINTS
Which describes how to calculate the range of this data set?
4, 5, 6, 8, 11, 12
Subtract 11-5.
Subtract 12-4.
Add 11+5.
Add 12+4.
Answer:
Highest value - lowest value. So 12-4
The total land area of Russia is about 20,000,000 km^2, or 2 x 10^7 km^2.
The total land area of Puerto Rico is about 10,000 km^2, or 2 x 10^2 km^2.
About how many times larger is Russia than Puerto Rico?
A. 2 x 10^-3 times
B. 19,990,000 times
C. 200 times
D. 2 x 10^3 times
Answer:
Im not sure but i think its 200 times
Step-by-step explanation:
Russia is 2 × 10³ times larger than Puerto Rico.
What is Exponentiation?Exponentiation is a method of writing numbers, especially larger numbers, as the power of some number. A number can be written in the exponent form as aᵇ, where 'a' is called the base and 'b' is called the power or exponent.
Total land area of Russia = 20,000,000 km² = 2 × 10⁷ km²
Total land area of Puerto Rico = 10,000 km² = 10⁴ km²
Let X be the number of times that Russia is larger than Puerto Rico.
Then we can write,
Total land area of Russia = X × Total land area of Puerto Rico
2 × 10⁷ km² = X × 10⁴ km²
X = 2 × 10⁷ km² / 10⁴ km²
X = 2 × 10⁷ × 10⁻⁴
X = 2 × 10³
Hence, about 2 × 10³ times larger is Russia than Puerto Rico.
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PLEASE HELP FAST! my two problems are in the photo.
Answer:
8.) x=115 degrees
9.) y=102 degrees
Step-by-step explanation:
8.) A triangles total degrees is 180, so 180-50=130. now the missing angles are congruent, so 130/2=65. and now we're working on the bottom right angle. which is 65. what we need can be added to the angle we just found to add up to 180, so reverse it. 180-65=115. so x=115 degrees.
9.) because y is congruent to the angle across from it, we can just assume y and 78 is equal to 180. 180-78=102. so y=102 degrees. Hope this helps!
HELP ILL GIVE BRAINLIEST
Answer:
I beleave the answer is C.
Step-by-step explanation:
that makes sence to me i beleave please mark me as brainlyest
Please answer quickly I’m doing my finals for this semester and I need help!
Answer:
The second one is correct
Step-by-step explanation:
