It takes 28 minutes to play 8 songs on a radio.Every song is played for the same length of time.How does it take to play 1 song?Express your answer as a mixed number or a decimal
Answer:
you would divide 28 by 8 and get 3.5. so around 3:30 per song
Step-by-step explanation:
Answer:
Step-by-step explanation:28÷8=3.5 , each song is 3 and a half minutes long
Simplify the expression 2+3i/4+3i
Please help
Answer:
17+6i
-----------
25
Step-by-step explanation:
2+3i
---------
4+3i
We want to multiply by the complex conjugate of the denominator
4+3i has a complex conjugate of 4-3i
2+3i 4-3i
--------- * --------------
4+3i 4-3i
Lets multiply the numerator
(2+3i) ( 4-3i)
2*4 +4*3i -3i*2 - 3i*3i =
8 +12i -6i - 9i^2
Remember i^2 = -1
8 +6i -9(-1)
17 +6i
Lets multiply the denominator
(4+3i) ( 4-3i)
4*4 +4*3i -3i*4 - 3i*3i =
16 +12i -12i - 9i^2
Remember i^2 = -1
16 -9(-1)
25
Putting numerator over denominator
17+6i
-----------
25
Solve the system of linear equations by substituting. Check your solution
I WILL MARK YOU BRAINLYEST
4# y=5x-7
-3x-2y=-12
5# -4x+y=6
-5x-y=21
6# -7x-2y=-13
x-2y=-13
There are 40 flavors of ice cream at the local ice cream store. 37.5% of the flavors contain chocolate. Which proportion could be used to calculate the total number of ice cream flavors that contain chocolate?
Can someone please explain this question?
Answer:
The limit does not exist
Step-by-step explanation:
lim as we approach from below 7
x+5 when x=7
7+5
12
lim as we approach from above 7
5x-25 when x=7
5*7 -25
35-25
10
The limit does not exist since these numbers are not the same
Answer:
Limit [tex]7^{-}[/tex] (left hand side limit) is 12
Limit [tex]7^{+}[/tex] (right hand side limit) is 10
Limit at 7 DOES NOT EXIST
Step-by-step explanation:
Limit [tex]7^{-}[/tex] means the limit from left side of 7Limit [tex]7^{+}[/tex] means the limit from left side of 7Limit at 7 will exist and would be equal IF BOTH SIDE limits are EQUAL, or else LIMIT DOESN'T EXIST!Limit [tex]7^{-}[/tex]:
When we want to find limit of left side of 7, we take the first part of the function shown (since its defined for [tex]x\leq7[/tex]).
We check values very close to 7 but less than it:
checking 6.98: [tex]6.98+5=11.98[/tex]checking 6.99: [tex]6.99+5=11.99[/tex]So the limit is approaching 12.
Thus, left hand side limit is 12.
Limit [tex]7^{+}[/tex]:
When we want to find limit of right side of 7, we take the second part of the function shown (since its defined for [tex]x>7[/tex]).
We check values very close to 7 but greater than it:
checking 7.02: [tex]5(7.02)-25=10.1[/tex]checking 7.01: [tex]5(7.01)-25=10.05[/tex]So the limit is approaching 10.
Thus, right hand side limit is 10.
Limit at 7:
If both right hand side limit and left hand side limit equal, then the limit at that specific number exists and is equal to it.
Since we see that the left hand limit (12) and the right hand limit (10) ARE NOT EQUAL, so we conclude that the limit at 7 for the function given DOES NOT EXIST.
What is the difference in height between an albatross flying at 100 m above the surface of the ocean and a shark swimming 30 m below surface? What is the distance between them if the shark is right below the albatross
Answer:
130 m
Step-by-step explanation:
Let surface of ocean be at 0 feet (sea level)
Albatross is 100 m ABOVE surface of ocean, andShark is 30 m BELOW the surface of oceanThe distance from albatross to surface is 100 and the distance from surface to shark is 30 m. The total distance between them is [tex]100+30=130[/tex]
Distance between shark and albatross is 130 m
Answer:
130 m
Step-by-step explanation:
Sarah drove 40 miles per hour . In 3 hours sarah drove 120 miles . Which is a vaild proportion to represent the problem?
Answer:
Step-by-step explanation:
1/40=3/120
7) Days People 1 26 2 30 3 34 4 38 5 42 6 46 The chart shows how many people have signed up to go on a field trip each day. 62 students are allowed to go on the field trip. On which day would you expect that number to be reached? A) 8 B) 9 C) 10 D)
Answer:The answer is mostly C) 10
Step-by-step explanation:
It's C because when you go to day 9, you count after 58 by adding 4 more, which equals 62 and then, since day 10) is 68 people that means that the answer is C.
Answer: c 10
Step-by-step explanation:
Since each day 4 more people sign up, on day 7, 50 will have signed up; on day 8, 54 people; day 9, 58 people; and day 10, 62 people
Erica has 1 over 3 of a watermelon to share equally with 3 friends. How much will each person get
Answer:
1/9
Step-by-step explanation:
1/3 ÷ 3 is the set-up for the problem we are trying to solve.
Remember when we divide fractions we multiply by the reciprocal. So we have:
1/3 × 1/3 since the reciprocal of 3/1 is 1/3
Multiplying 1/3 x 1/3 we find the product is 1/9
Therefore, each person would receive 1/9 of the watermelon
Which expression, when simplified, is equal to 7p? A) 9p – 2pq – 7p – 5p + 2pq B) 9p – 2pq – 7p + 5p – 2pq C) 9p + 2pq – 7p + 5p – 2pq D) 9p + 2pq + 7p + 5p – 2pq E) 9p + 2pq – 7p + 5p + 2pq
Answer:C
Step-by-step explanation:
2pq - 2pq is zero. B and E have no zero pq coefficient.
p(9-7+5) = 7p
Answer:
c
Step-by-step explanation:
i did the test lol
A person who weighs 120 pounds on Earth weighs 20 pounds on the Moon. How much does a 93-pound person weigh on the Moon? A person who weighs 120 pounds on Earth weighs 20 pounds on the Moon. How much does a 93-pound person weigh on the Moon? Item 22 A person who weighs 120 pounds on Earth weighs 20 pounds on the Moon. How much does a 93-pound person weigh on the Moon?
The relationship between the weight of a person on Earth and the
person's weight on the Moon is a proportional relationship.
The weight of a 93 pounds person on the Moon is 15.5 pounds.Reasons:
The weight of the person on Earth = 120 pounds
Weight of the person on the Moon = 20 pounds
Required:
The weight of a person that weighs 93 pounds on Earth on the Moon
Solution:
Let x represent the factor (acceleration due to gravity) on Earth, let y
represent the factor on the Moon, and let m, represent the mass of the
person, we have;
x·m = 120
y·m = 20
Therefore;
[tex]\displaystyle \mathbf{\frac{x \cdot m}{y \cdot m}} = \mathrm{\frac{x}{y} } = \frac{120}{20} = 6[/tex]
For the person that weighs 93 pounds on Earth, we have;
[tex]\displaystyle \mathrm{\frac{x}{y} } = \mathbf{\frac{93}{Weight \ on \ the \ Moon}} = 6[/tex]
Which gives;
[tex]\displaystyle Weight \ of\ the \ person\ on \ the\ Moon = \frac{93}{6} = 15.5[/tex]
The weight of the person on the Moon = 15.5 pounds
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Explain how mental math can be used to estimate a 15% tip on a taxi ride that costs $23.25 Find the tip using that method. Halp pllz!
Answer:
$3.4875
Step-by-step explanation:
AS the ride is completed and according the rule the person have to give a tip on the total taxi ride
according to the given
tip given 15%
Total ride cost = $23.25
To find is the total tip given in dollars
Solution:
Total tip in dollars = 15 % of total ride cost
Putting the values of the given
Total tip in dollars = 15 % of 23.25
it can be written as
= [tex]\frac{15*23.25}{100}[/tex]
=[tex]\frac{348.75}{100}[/tex]
=$ 3.4875
So the total tip would be $3.4875
Answer:
3.50 cent
Step-by-step explanation:
I take 10% and 20% of the number. For this ride, that would be about $2.33 and 4.66.
Then I estimate what is about half way between those two numbers. It looks like about $3.50 would be about 15%.
AD _____ EC
Choose the relationship symbol to make a true statement.
<
=
>
Answer:
AD>EC
Step-by-step explanation: If you look at the two traingles, angle AD is a bit larger than angle EC, this is due to the degrees of the angles, EC-> 25,
AD-> 30, this makes the triangle of AD, greater than EC.
Two polygons are similar. The perimeter of the larger polygon is 85 meters and the ratio of the corresponding side lengths is [tex]\frac{2}{5}[/tex]. Find the perimeter of the other polygon.
Suppose the polygons have 3 sides, [tex]s_1,s_2,s_3[/tex]. In the smaller polygon, the corresponding sides would have lengths [tex]\dfrac25s_1,\dfrac25s_2,\dfrac25s_3[/tex].
So if the perimeter of the larger polygon is
[tex]s_1+s_2+s_3=85[/tex]
then the perimeter of the smaller polygon would be
[tex]\dfrac25(s_1+s_2+s_3)=\dfrac25\cdot85[/tex]
so its perimeter would be 34 meters.
Final answer:
The perimeter of the smaller similar polygon is 34 meters, calculated by setting up and solving the proportion 2/5 = P/85.
Explanation:
When dealing with similar polygons, the ratio of their corresponding side lengths is the same as the ratio of their perimeters. Given that the ratio of the sides is 2 to 5, and the perimeter of the larger polygon is 85 meters, we can set up a proportion to find the perimeter of the smaller polygon.
Let the perimeter of the smaller polygon be P. The proportion will be 2/5 = P/85. To find P, we cross-multiply and get: 2 * 85 = 5 * P. Simplifying, we find that P equals 34 meters. Hence, the perimeter of the smaller polygon is 34 meters.
Which letter on the number line represents the solution to -2.5r = -20? A) Point P B) Point Q Eliminate C) Point R D) Point S
Answer:
Point R = 8
Step-by-step explanation:
-2.5 r = -20
The solution to this equation is represented by a number line
In the given equation we have only the variable 'r'
We will get the value of 'r' while solving the above equation
That 'r' value is the solution point R on number line
[tex]-2.5r = -20[/tex]
divide by -2.5 on both sides
[tex]r=\frac{-20}{-2.5}[/tex]
r= 8 is our solution
From which language does the underlined phrase originate? When the house guests arrived, Granny said, "Mi casa es su casa." A. French B. Italian C. Spanish D. Algonquian Please select the best answer from the choices provided A B C D
The correct answer is option C - Spanish.
From which language does the underlined phrase originate? When the house guests arrived, Granny said, "Mi casa es su casa."
"mi casa es su casa" is a common Spanish expression which means - "welcome" or "make yourself at home" Mi casa es su casa literally means "my house is your house".
Consider the functions. How do the graphs of these function compare to one another? (In picture)
Answer: True, False, True
Step-by-step explanation:
To determine steepness, compare the coefficients of each function:
f(x) = 4x² coefficient is: 4
g(x) = [tex]\dfrac{15}{4}x^2[/tex] coefficient is: 4.75
h(x) = [tex]\dfrac{4}{15}x^2[/tex] coefficient is: 0.27
f(x) ??? h(x)
4 > 0.27
f(x) is steeper than h(x)
h(x) ??? g(x)
0.27 < 4.75
h(x) is LESS steep than g(x)
g(x) ??? f(x)
4.75 > 4
g(x) is steeper than f(x)
One side of a kite is 5 cm less than 2 times the length of another. If the perimeter is 14 cm, find the length of each side of the kite.
A) 5 cm, 5 cm
B) 4.2 cm, 3.4 cm
C) 6.3 cm, 7.7 cm
D) 4 cm, 3 cm
Answer:
Step-by-step explanation:
Alright, lets get started.
Suppose one side of the kite is x
One side of a kite is 5 cm less than 2 times the length of another.
So, another side of the kite will be = [tex]2x-5[/tex]
So, the all 4 sides of the kite will be x, x , 2x-5 and 2x-5
The perimeter of the kite will be = [tex]x+x+2x-5+2x-5=6x-10[/tex]
As per given in question, perimeter is 14, so
[tex]6x-10=14[/tex]
Adding 10 in both sides
[tex]6x=24[/tex]
Dividing 6 in both sides
[tex]x=4[/tex]
So, another side is [tex]2*4-5=3[/tex]
So, the sides are 4 cms and 3 cms : Answer D
Hope it will help :)
Answer:
D) 4 cm, 3 cm
Step-by-step explanation:
Since we know that kite is made of two sets of equal sides.
Let x be the length of one of equal sides and y be length of another side of equal sides.
We have been given that one side of a kite is 5 cm less than 2 times the length of another. We can represent this information as:
[tex]x+5=2y...(1)[/tex]
We are also told that the perimeter is 14 cm. We can represent this information as:
[tex]2(x+y)=14...(2)[/tex]
From equation (1) we will get,
[tex]x=2y-5[/tex]
Substituting this value in equation (2) we will get,
[tex]2(2y-5+y)=14[/tex]
[tex]2(3y-5)=14[/tex]
[tex]6y-10=14[/tex]
[tex]6y-10+10=14+10[/tex]
[tex]6y=24[/tex]
[tex]y=\frac{24}{6}[/tex]
[tex]y=4[/tex]
Therefore, length of one side of kite is 4 cm.
Upon substituting y=4 in equation (1) we will get,
[tex]x+5=2*4[/tex]
[tex]x+5=8[/tex]
[tex]x+5-5=8-5[/tex]
[tex]x=3[/tex]
Therefore, the length of another side of kite is 3 cm and option D is the correct choice.
A family purchased tickets for a concert. They paid a total of $90 for 7 adult tickets and 12 child tickets. The price of a child ticket was two-thirds the price of an adult ticket.How much was the price of an adult ticket
Answer: 7 + 2/3(12) = 15
90/15 = $6 for adult tickets
The parent function is f(x)=2^x−6+3 and the new function is g(x)=2^x − 3+2 .
How does the graph change from f(x) to g(x) ?
Select each correct answer.
The graph is shifted 3 units right.
The graph is shifted 1 unit up.
The graph is shifted 1 unit down.
The graph is shifted 3 units left.
Answer:
left 3 units
down 1 unit
Step-by-step explanation:
The required transformation is obtained by shifting of 3 units left and 1 unit down. The correct options are (c) and (d).
How to transform a graph of the function?The graph of a function can be transformed by either shifting it in the right, left, up or down.
When the transformation is rightwards, the function becomes as f(x - a).
The given functions are as below,
f(x) = [tex]2^{x - 6} + 3[/tex]
And, g(x) = [tex]2^{x - 3} + 2[/tex]
It can be rewritten as,
g(x) = [tex]2^{x - 3} + 2[/tex] = [tex]2^{x - 6 + 3} + 3 - 1[/tex]
It clearly shows as per the rule of transformation, f(x) is shifted 3 units left and 1 unit down to get g(x).
Hence, the parent function f(x) is shifted 3 units left and 1 unit down.
To know more about transformation of graph click on,
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In your neighborhood, 7/25 of your neighbors have dogs. This is equivalent to what decimal?
See the attached picture:
The fraction 7/25 translates to the decimal 0.28 in mathematics.
Explanation:In the question, we are to translate the fraction 7/25 to a decimal. This is a straightforward conversion in the field of mathematics. To convert this fraction to a decimal, we divide the numerator (the top number) by the denominator (the bottom number), yielding 7 ÷ 25 = 0.28. Therefore, the fraction 7/25 is equivalent to the decimal number 0.28 when rounded to two decimal places.
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Justing has 20 pencils, 25 erasers, and 40 paper clips. He organize them into groups with the same number of items and each group. All the items in. Group will be the same type. How many items can he put in each group?
Answer:
The answer is 17 items in 5 groups.
Step-by-step explanation:
If we have 20 pencils + 25 erasers + 40 paper clips; that´s a total of 85 items.
Then we just divide all the items into 5 groups so we can have the same amount of items in each group.
85 items ÷ 5 groups = 17 items each.
17 x 5 = 85.
Drew delivers packages in city.He makes 30$ for working an 8-hour day.He also makes $4.25 for each package he delivers. If X represents the number of packages he delivers, which equation describes his daily income?
Answer:
767
Step-by-step explanation:
Solve the system by substitution. Show your work. 4 pts 2) -2x - 3 y = -2 y = 2x + 6
Solve the system by elimination. Show your work. 4 pts
3) -x - 18 y = -3
7x - 9 y = 21
please help
I need this before midnight 12/19/2018
Answer:
2. x=-2 y= 2
3. x=3 y=0
Step-by-step explanation:
-2x - 3 y = -2
y = 2x + 6
The first step is to get x and y on the same side
Take the second equation and subtract 2x from each side
-2x+ y = 2x-2x + 6
-2x+y = 6
Multiply this by -1
-1(-2x+y) =-1*6
2x -y =-6
Add this to the first equation to eliminate x
-2x - 3 y = -2
2x -y =-6
--------------------
-4y = -8
Divide by -4
-4y/-4 = -8/-4
y =2
Now we need to find x
y = 2x + 6
Substituting in y=2
2 = 2x+6
Subtract 6 from each side
2-6 = 2x+6-6
-4 = 2x
Divide by 2
-4/2 = 2x/2
-2 =x
3) -x - 18 y = -3
7x - 9 y = 21
We will eliminate by by multiplying the second equation by -2
-2(7x - 9 y) = -2*21
-14x + 18y = -42
Now we will add this to the first equation
-x - 18 y = -3
-14x + 18y = -42
-------------------------
-15x = -45
Divide by -15
-15x/-15 = -45/-15
x =3
We still need to solve for y
-x -18y = -3
Substituting in x =3
-3 -18y = -3
Add 3 to each side
-3+3 -18y =-3+3
-18y =0
Divide by -18
y= 0
1
8
of the boys at a high school tried out for the football team,
1
6
tried out for the baseball team, and
1
12
tried out for the football team and baseball team. What fraction of those who tried out for football also tried out for baseball?
Answer:
78
Step-by-step explanation:
112-18-16=78
Answer:
Correct answer is 2/3.
Step-by-step explanation:
Shawn is coasting down a 500 cm long ramp on his inline skates. The wheels on his inline skates are 32 cm in circumference. How many rotations does each wheel make while Shawn is coasting down the ramp? Plz help
Answer:
16 rotations.
Step-by-step explanation:
We have been given that Shawn is coasting down a 500 cm long ramp on his inline skates. The wheels on his inline skates are 32 cm in circumference.
To find the number of rotations we will divide length of ramp by 32 as distance covered by wheels in one rotation will be equal to 32 cm.
[tex]\text{Number of rotations}=\frac{\text{Total distance}}{\text{Circumference of wheel}}[/tex]
[tex]\text{Number of rotations}=\frac{500}{32}[/tex]
[tex]\text{Number of rotations}=15.625\approx 16[/tex]
Therefore, each wheel must make 16 rotations while Shawn is coasting down the ramp.
Select the equation which graphs to a vertical line at -3.
A) y=-3
B) x=-3
C) y=-3x
D) x=-3y
Answer: B) x = -3
Every point on this line has one thing in common: the x coordinate is -3. This is why x is fixed at -3, so we simply say the equation is x = -3
Some example points on this line are (-3,10) and (-3,2)
The y coordinate can be anything you want, so that is why it doesn't show up at all (because it doesn't affect how x will turn out).
Anna wants to buy season passes to two theme parks. If one season pass costs $54.99 and Anna has $100 to spend on both passes, the second pass has to cost no more than what amount?
Answer:
54.01
If it’s an less than problem then
49.01<54.01<100
Step-by-step explanation:
100-54.99
= 54.01
Write the quadratic equation in standard form for the following equations
(7,4);(-2,1);(1,9)
Answer:
[tex]y=-\frac{7}{18}x^2+\frac{41}{18}x+\frac{64}{9}[/tex]
Step-by-step explanation:
We need to write a quadratic equation so we can use standard quadratic equation:
[tex]y=ax^2+bx+c[/tex]
Plug the given points to get three equations.
for (7,4), we plug x=7 and y=4
[tex]4=a(7)^2+b(7)+c[/tex]
[tex]4=49a+7b+c[/tex] ...(i)
similarly using other two points, we get:
[tex]1=4a-2b+c[/tex] ...(ii)
[tex]9=a+b+c[/tex] ...(iii)
Now we solve those three equations by any method like substitution, or matrices or by any method and get:
[tex]a=-\frac{7}{18},\ b=\frac{41}{18},\ c=\frac{64}{9}[/tex]
Now plug these values into [tex]y=ax^2+bx+c[/tex], we get final equation as:
[tex]y=-\frac{7}{18}x^2+\frac{41}{18}x+\frac{64}{9}[/tex]
98 points please help with math:
What is the equation of a line that is parallel to y=5/6x − 10 and passes through (12, 8) ?
Answer:
[tex] \displaystyle y _{ \text{parallel}} = \frac{5}{6} x- 2[/tex]
Step-by-step explanation:
we are given a equation of line
[tex] \displaystyle y = \frac{5}{6} x - 10[/tex]
we want to figure out the line Parallel to the given line and passes through (12,8)
to figure out the parallel line we need to figure out two things one is the Slope of the parallel line another is the y-intercept of the parallel line
figuring out the slope of the parallel line is easy because we know that parallel lines have the same slope therefore,
[tex] \displaystyle m _{ \text{parallel}} = \frac{5}{6} [/tex]
now we need to figure out the y-intercept and the equation to do so we can consider the following formula:
[tex] \displaystyle y - y_{1} = m(x - x_{1})[/tex]
we the point where the parallel line passes i.e [tex](x_1,y_1)=(12,8)[/tex] and we already got that the slope is ⅚ thus substitute:
[tex] \displaystyle y - 8= \frac{5}{6} (x- 12)[/tex]
we can figure out the equation by simplifying the above equation to slope-intercept form in order to do so
distribute:
[tex] \displaystyle y - 8= \frac{5}{6} x- \frac{5}{6} \times 12[/tex]
reduce fraction:
[tex] \displaystyle y - 8= \frac{5}{6} x- 5 \times 2[/tex]
simplify multiplication:
[tex] \displaystyle y - 8= \frac{5}{6} x- 10[/tex]
add 8 to both sides:
[tex] \displaystyle y = \frac{5}{6} x- 2[/tex]
and we are done!