Answer:
B
Step-by-step explanation:
Put the second y into the first equation
3x + y = 10 substitute for y
3x + 6x + 1 = 10 Combine like terms on the left
9x + 1 = 10 Subtract 1 from both sides
9x = 10 - 1 Combine the right.
9x = 9 Divide by 9
x = 9/9 Divide
x = 1
The answer is right there. Only B is possible
y = 6x + 1
y = 6(1) + 1
y = 6 + 1
y = 7
Answer B
Heidi's mom made flower arrangements for a party.She made 4 times as many rose arrangements as tulips arrangements.Heidi's mom made a total of 40 arrangements. How may arrangements of each type did Heidi's mom make?
Answer: 32 Rose Arrangements & 8 Tulip Arrangements
Step-by-step explanation: The number of arrangements for each flower is unknown (n) but the total is known, 40 arrangements. There are 4 times as many rose arrangements than tulip meaning 4n rose + n tulip = 40, 4n + n = 40, 5n = 40, 40 ÷ 5 = n, n = 8. Roses = 4n = 4x8= 32. Tulips = n = 8.
A rescue helicopter is used to help victims who fell in a ditch. The helicopter begins at sea level, which is an elevation of 0 feet. It then travels down for 100 seconds at a speed of 10.5 feet per second. It then travels directly up for 150 seconds at a speed of 5.2 feet per second. After this 250 second period, how much time, in seconds, will it take for the rescue helicopter to travel back to sea level at the helicopter's maximum speed of 15.8 feet per second?
Answer:
Answer is 17.088 seconds
Step-by-step explanation:
We have given,
Speed of helicopter while going down = 10.5feet/sec
Time taken to travel down = 100 sec
Distance covered while going down = speed * time
Distance covered while going down = 10.5 * 100
Distance covered while going down = 1050 feet
Now,
Speed of helicopter while going up = 5.2feet/sec
time taken to travel up = 150 sec
Distance covered while going up = 5.2 * 150 = 780 feet
After this 250 second period , the position of helicopter will be:
Position of helicopter = distance covered in downward - distance covered upward
Position of helicopter = 1050 - 780 = 270 feet
That means we need to travel upward a distance of 270 feet at a maximum speed of 15.8feet/sec to reach sea level.
Time taken to reach sea level = distance/ speed = 270/15.8 = 17.088 sec
Hence time taken to reach at sea level with maximum speed is 17.088 seconds.
what is the standard deviation of the numbers 77,45,72,56,98,60,70,89,50,80,95,70,34,77,65,70,70,82,86,86
Answer:
The standard deviation of the numbers is 16.154.
Step-by-step explanation:
The given observations are
77,45,72,56,98,60,70,89,50,80,95,70,34,77,65,70,70,82,86,86
Average or mean of the data is
[tex]\bar{X}=\frac{\text{Sum of observations}}{\text{Total number of observations}}[/tex]
[tex]\bar{X}=\frac{1432}{20}=71.6[/tex]
The Standard deviation of the data is
[tex]\sigma=\sqrt{\frac{\sum (X-\bar{X})^2}{n}}[/tex]
[tex]\sigma=\sqrt{\frac{5218.8}{20}}[/tex]
[tex]\sigma=\sqrt{260.94}[/tex]
[tex]\sigma=\sqrt{16.154}[/tex]
Therefore standard deviation of the numbers is 16.154.
Find u and v only please:
Every two triangles are similar. Therefore the sides of triangles are in proportion.
We have the equations:
1.
[tex]\dfrac{3}{5}=\dfrac{3+x}{20}[/tex] cross multiply
[tex]5(3+x)=(3)(20)[/tex] divide both sides by 5
[tex]3+x=(3)(4)[/tex]
[tex]3+x=12[/tex] subtract 3 from both sides
[tex]\boxed{x=9}[/tex]
--------------------------------------
2.
[tex]\dfrac{3}{4}=\dfrac{9}{y}[/tex] cross multiply
[tex]3y=(4)(9)[/tex]
[tex]3y=36[/tex] divide both sides by 3
[tex]\boxed{y=12}[/tex]
------------------------------------------
3.
[tex]\dfrac{3}{5}=\dfrac{3+9+u}{60}[/tex]
[tex]\dfrac{3}{5}=\dfrac{12+u}{60}[/tex] cross multiply
[tex]5(12+u)=(3)(60)[/tex] divide both sides by 5
[tex]12+u=(3)(12)[/tex]
[tex]12+u=36[/tex] subtract 12 from both sides
[tex]\boxed{u=24}[/tex]
----------------------------------------------
4.
[tex]\dfrac{3}{4}=\dfrac{24}{v}[/tex] cross multiply
[tex]3v=(4)(24)[/tex]
[tex]3v=96[/tex] divide both sides by 3
[tex]\boxed{v=32}[/tex]
$64 jacket; 20% discount [plzzzzz help me ]
Answer:
$51.20
Step-by-step explanation:
A 20% discount makes it 80% of the original price.
80% is 0.8 of something so multiply $64 by 0.8 to get your answer of $51.20
How to find the measure of a triangle?
Hi there! :)
Answer:
The answer is D. 83°
Step-by-step explanation:
You should know that the interior angles of a triangle always add up to 180°.
So, what you will need to do, is add all 3 angles together and create an equation (equal to 180). Then you need to solve this equation by isolating "x":
(8x + 12) + (55 - 3x) + (10x + 23) = 180
Get rid of all the parentheses
8x + 12 + 55 - 3x + 10x + 23 = 180
Add all similar terms together
8x - 3x + 10x = 15x
12 + 55 + 23 = 90
15x + 90 = 180
Subtract "90" from each side of the equation → 180 - 90 = 90
15x = 90
Divide each side of the equation by "15" → 90 ÷ 15 = 6
x = 6
Since you now know that the value of "x" is 6, you can now find the measure of the angle at George's position by replacing the "x" by 6:
10x + 23 = Measure of the angle at George's position
10(6) + 23
Multiply 10 by 6 → 10 × 6 = 60
60 + 23
Add 60 and 23 together → 60 + 23 = 83
83 = Measure of the angle at George's position
There you go! I really hope this helped, if there's anything just let me know! :)
Rita has 3/4 gallon of lemonade she pours 1/24 gallon of lemonade into each glassk Rita has 3/4 gallons of lemonade she pours one 24 gallon of lemonade into each glass how many glasses of lemonade can she pour
Answer:
18 number of glasses of lemonade can she pour
Step-by-step explanation:
Unit rate defined as rates are expressed as a quantity of 1, such as 3 feet per second or 8 miles per hour, they are called unit rates.
As per the statement: Rita has 3/4 gallon of lemonade she pours 1/24 gallon of lemonade into each glass.
Number of lemonade Rita has = 3/4 gallon
[tex]\text{Unit rate per glass} = \frac{1}{24} \text{gallons}[/tex]
By definition of unit rate;
[tex]\text{Number of glasses} = \frac{\text{Number of lemonade}}{\text{Unit rate per glass}}[/tex]
Substitute the given values we get;
[tex]\text{Number of glasses} = \frac{\frac{3}{4}}{\frac{1}{24}}[/tex]
[tex]\text{Number of glasses} = \frac{3}{4} \times 24 = 3 \times 6 = 18[/tex]
Therefore, number of glasses of lemonade can she pour is, 18
Will mark brainliest! :D
Answer: 137 + 4(n-1)
Step-by-step explanation:
137 + 4(n-1)
Okay, let's test this starting with week 1:
137 + 4(1-1)
137 + 4*0
137, which is correct because she starts with 137.
Week 2:
137 + 4 (2-1)
137 + 4 * 1
137 + 4
141
Alright, let's see if it is correct if we do week 5:
137 + 4 (5-1)
137 + 4(4)
137 + 16
153
To know that 153 is right we could do 137 + 4 + 4 + 4 + 4, which equals 153.
Literal Equations
c-b/a=1
Equation for a
a= b/c - 1
Equation for b
b= ca - a
Equation for c
c= b/a + 1
Each year, thousands of people visit Yellowstone national park. Audiotapes for visitors include interviews with early settlers and information about geology, wildlife, and activities of the park. The revenue r(x) from the sale of x tapes is r(x)=9.5x. Suppose that the function for the cost of manufacturing x tapes is c(x)=0.8x+1940.
What function could be used to find the profit on x tapes?
a. Write the profit function.
b.find the profit on 500, 1000, and 5000 tapes.
c. Check by finding the revenue and the cost for each number of tapes and subtracting to find profit
Answer: p(x) = 8.7x - 1940
p(500) = $2410
p(1000) = $6760
p(5000) = $41,560
Step-by-step explanation:
p(x) = r(x) - c(x)
= 9.5x - (0.8x + 1940)
= 9.5x - 0.8x - 1940
= 8.7x - 1940
**********************************************************************
p(500) = 8.7(500) - 1940
= 4350 - 1940
= 2410
p(1000) = 8.7(1000) - 1940
= 8700 - 1940
= 6760
p(5000) = 8.7(5000) - 1940
= 43,500 - 1940
= 41,560
***************************************************************************
p(500) = r(500) - c(500)
= 9.5(500) - [0.8(500) + 1940]
= 4750 - (400 + 1940)
= 4750 - 2340
= 2410
p(1000) = r(1000) - c(1000)
= 9.5(1000) - [0.8(1000) + 1940]
= 9500 - (800 + 1940)
= 9500 - 2740
= 6760
p(5000) = r(5000) - c(5000)
= 9.5(5000) - [0.8(5000) + 1940]
= 47500 - (4000 + 1940)
= 47500 - 5940
= 41,560
Can someone please help me with this question? Thanks if you do!
A secant is a line that intersects a circle at two points.
Therefore your answer is
[tex]\boxed{D.\ \overline{AD}}[/tex]
OB - radius
DE - tangent
FC - chord
AB - some segment
Katelyn did this work to solve an equation. Did she make an error?
4(x-2)-3=7x
4x-2-3=7x
Answer: The right answer is this:
Katelyn did make an error. She also needs to multiply 4 by −2.
4−8−3=7
Step-by-step explanation:
Answer:
Katelyn did make an error. She also needs to multiply 4 by −2.
4x−8−3=7x
Step-by-step explanation:
How do you solve this?
Answer:
Multiply 60 by .40
60 * .40 = 24
Answer is B
Step-by-step explanation:
What is the value of y ?enter your answer in the box
Answer:
I believe the answer is 20.
Step-by-step explanation:
solve the inequality algebraically. express your answer using interval or set notation. graph the solution set. -5 less than or equal to 4 - 3x less than or equal to 2
Step-by-step explanation:
This ≤ inequality sign means:
Less than/Equal toNo more thanAt mostMaximum of-5 ≤ 4
And then:
-3x ≤ 2
OR:
-5 ≤ 4 -3x ≤ 2
Hi!!! Sorry, I didn't know if they were suppose to be together or separate, so I just did it both ways!!! :) Really sorry if I am wrong...
The beginning balance on the money bank staremaent for Dorsey checking account was 452.76 and the ending balance was 197.59 what can be said about Dorsey transactions for the month ?
Answer: D He has 255.17 more in debts than in credits
Step-by-step explanation:
Finished A P E X
So I don't if I'm right help would be much appreciated
Answer:
A is the correct equation
Step-by-step explanation:
Select the three ratios that are equivalent to 3 boys/5 girls.
8 boys/10 girls
15 boys/25 girls
9 boys/15 girls
30 boys/50 girls
99 points!!
[tex]\dfrac{3\ boys}{5\ girls}\to\dfrac{3}{5}\\\\\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\\\\\dfrac{15}{25}=\dfrac{15:5}{20:5}=\dfrac{3}{5}\\\\\dfrac{9}{15}=\dfrac{9:3}{15:3}=\dfrac{3}{5}\\\\\dfrac{30}{50}=\dfrac{30:10}{50:10}=\dfrac{3}{5}\\\\Answer:\\\\\boxed{\dfrac{3\ boys}{5\ girls}=\dfrac{15\ boys}{25\ girls}=\dfrac{9\ boys}{15\ girls}=\dfrac{30\ boys}{50\ girls}}[/tex]
Can someone help me with Geometry. Please no fake awnsers you will be reported
Answer:
M = (a/2, 0) and N = (0, b/2)
Step-by-step explanation:
The x coordinate of the M = midpoint of AB = a/2. y coordinate = 0.
Coordinates of M are (a/2, 0)
The y coordinate of the N = midpoint of AC = b/2. x coordinate = 0.
Coordinates of N are (0, b/2))
The question concerns Geometry, a branch of mathematics focused on points, lines, surfaces, and solids. Students should learn foundational concepts like the Pythagorean theorem and properties of shapes to succeed. Detailed, practice-oriented help can be provided for specific problems.
Explanation:The subject of the question relates to Geometry, which is a branch of mathematics concerned with the properties and relations of points, lines, surfaces, and solids. Geometry can be a challenging subject, but by breaking down problems into smaller parts and understanding the fundamental concepts, you can solve complex problems more easily.
For example, when learning about triangles, you will need to understand concepts such as the Pythagorean theorem, which deals with the relationship between the lengths of the sides of a right triangle. In Geometry, you will also encounter various shapes and figures, learn to calculate areas and volumes, and understand theorems that describe the properties of these shapes. It's essential to grasp these foundational ideas to advance in the subject.
If you have a specific Geometry problem or concept that you are struggling with, feel free to ask for detailed help. Remember, practice is key to mastering Geometry, so keep working through problems and utilize resources that can aid your understanding.
express 4.08 as mixed number
Answer:
its 4 2/25 :P
Step-by-step explanation:
hi!!!
sheral got theses socres on her spelling test
95,89,99,85,82
what is the mean of absolute devitationof her test scores
Which of the following sets represents the range of the function shown?
Answer:
{0, -1, 11, 13 }
Step-by-step explanation:
the range of the function are the corresponding values of y from the set of points, in ascending order, that is
{0, -1, 11, 13 }
Answer:
Step-by-step explanation:
The range is the set of y values of the function.
{0, -1, 11, 13]
How would I put equations like these in Standard Form?
4x-y-7=0
3x+9= (7/2)y
y=-4x+12
y=(-3/4)x+(5/4)
The standard form:
[tex]Ax+By=C[/tex]
[tex]4x-y-7=0\qquad\text{add 7 to both sides}\\\\\boxed{4x-y=7}[/tex]
[tex]3x+9=\dfrac{7}{2}y\qquad\text{multiply both sides by 2}\\\\6x+18=7y\qquad\text{subtract 18 and 7y from both sides}\\\\\boxed{6x-7y=-18}[/tex]
[tex]y=-4x+12\qquad\text{add 4x to both sides}\\\\\boxed{4x+y=12}[/tex]
[tex]y=-\dfrac{3}{4}x+\dfrac{5}{4}\qquad\text{multiply both sides by 4}\\\\4y=-3x+5\qquad\text{add 3x to both sides}\\\\\boxed{3x+4y=5}[/tex]
Which statements are true? Check all that apply. (The formula for the area of a triangle is A = 1/2 bh)
A. BC = 6 cm
B. AC = 5 cm
C. BA = 4 cm
d. The perimeter of triangle ABC = 12 cm
E. The area of the triangle ABCc is 1/3 the area of triangle DEF
Answer:
C) BA=4 cm
D)the perimeter of triangle ABC= 12 cm
Step-by-step explanation:
Answer:
234
Step-by-step explanatio:acabo de
a
solving multi step equations x+x+2=3(x+1)+12
Make an equation to represent the area of a square whose sides are given by the expression x+y
Answer:
B. area = x^2 + 2xy + y^2
Step-by-step explanation:
Area of square with side s is s^2.
This square has side x + y, so
area = (x + y)^2
area = (x + y)(x + y)
area = x^2 + xy + xy + y^2
area = x^2 + 2xy + y^2
Answer:
B
Step-by-step explanation:
area of a square = s² ( s is the side length )
here s = x + y, hence
area = (x + y)² ← expand using FOIL )
= x² + xy + xy + y² = x² + 2xy + y² → B
Apex please help
a.)graph d
b.) graph b
c.) graph a
d.) graph c
Answer:
GRAPH D
Step-by-step explanation:
BECASUE IT IS THE WRIGHT ANSWER
What is the solution to the system of equations graphed below?
Answer:
A. (3,0)
Step-by-step explanation:
When the equations are graphed, the solution is where the two graphs cross. For the red line and the blue line, the cross at (3,0)
We can check this by substituting x=3 into both equations and seeing if we get y=0
y = -x+3
y = -3+3
y =0
y = x-3
y = 3-3
y=0
In both cases, we got y=0.
Therefore (3,0) is a solution to both equations and since it solves both equations, it solves the system.
Which function is the best inverse of f(x)=x2-9
Answer:
The inverse is sqrt(x+9)
Step-by-step explanation:
f(x)=x^2-9
To find the inverse of the function, we interchange x and y and solve for y
y = x^2 -9
x = y^2 -9
Add 9 to each side
x+9 = y^2 -9+9
x+9 = y^2
Take the square root of each side
sqrt(x+9) = sqrt(y^2)
sqrt(x+9) = y
f^-1 (x) = sqrt(x+9)
−4/1a−4= 4/7a−3 solve for a
Answer:
a = (-7)/32 or a= 0.21875
Step-by-step explanation:
Solve for a:
-4 a - 4 = (4 a)/7 - 3
Put each term in (4 a)/7 - 3 over the common denominator 7: (4 a)/7 - 3 = (4 a)/7 - 21/7:
-4 a - 4 = (4 a)/7 - 21/7
(4 a)/7 - 21/7 = (4 a - 21)/7:
-4 a - 4 = (4 a - 21)/7
Multiply both sides by 7:
7 (-4 a - 4) = (7 (4 a - 21))/7
(7 (4 a - 21))/7 = 7/7×(4 a - 21) = 4 a - 21:
7 (-4 a - 4) = 4 a - 21
Expand out terms of the left hand side:
-28 a - 28 = 4 a - 21
Subtract 4 a from both sides:
(-28 a - 4 a) - 28 = (4 a - 4 a) - 21
-28 a - 4 a = -32 a:
-32 a - 28 = (4 a - 4 a) - 21
4 a - 4 a = 0:
-32 a - 28 = -21
Add 28 to both sides:
(28 - 28) - 32 a = 28 - 21
28 - 28 = 0:
-32 a = 28 - 21
28 - 21 = 7:
-32 a = 7
Divide both sides of -32 a = 7 by -32:
(-32 a)/(-32) = 7/(-32)
(-32)/(-32) = 1:
a = 7/(-32)
Multiply numerator and denominator of 7/(-32) by -1:
Answer: a = (-7)/32
The solution to the equation is [tex]\(a = -\frac{25}{32}\)[/tex].
To solve the equation [tex]\(\frac{-4}{1}a - 4 = \frac{4}{7}a - 3\) for \(a\)[/tex], follow these steps:
1. Simplify the equation by multiplying both sides by their respective denominators to eliminate the fractions:
[tex]\[ 7(-4a - 4) = 1(4a - 3) \][/tex]
2. Distribute the numbers outside the parentheses:
[tex]\[ -28a - 28 = 4a - 3 \][/tex]
3. Move all terms containing a to one side of the equation and constants to the other side:
[tex]\[ -28a - 4a = -3 + 28 \][/tex]
4. Combine like terms:
[tex]\[ -32a = 25 \][/tex]
5. Solve for a by dividing both sides by -32:
[tex]\[ a = \frac{25}{-32} \][/tex]
Therefore, the solution to the equation is [tex]\(a = -\frac{25}{32}\)[/tex].