can someone help me please?? :))

Can Someone Help Me Please?? :))

Answers

Answer 1
Answer:   52.8 minutes

====================================================

How I got that answer:

The interval 0 < t < 30 has the midpoint of 15 since (0+30)/2 = 15

The interval 30 < t < 60 has the midpoint 45 because (30+60)/2 = 45

We add up the endpoints and then divide by 2 to get the midpoint.

Repeat this for each of the intervals mentioned.

From top to bottom, the midpoints are:

154575105

Notice we add 30 to each midpoint to get the next one. This is directly due to the fact that each interval is 30 units wide (eg: 90-60 = 30).

Multiply each midpoint by the corresponding frequency for a given row.

15*7 = 10545*27 = 121575*12 = 900105*4 = 420

Then add up those products.

105+1215+900+420 = 2640

Lastly, we divide this over the sum of the frequencies 7+27+12+4 = 50 to get 2640/50 = 52.8

The average time spent on homework is estimated to be about 52.8 minutes

Note that the majority of the the students (27) are in the 30 < t < 60 interval, so the mean of 52.8 fits this interval perfectly. It's closer to the right endpoint of the interval due to the fact the other 12+4 = 16 students are above this, and they make up the second most majority compared to the 27.

The reason why 52.8 is an estimate rather than the actual mean is because we are estimating each interval by picking out the midpoint each time. The midpoint is at the direct center, so it's the best guess we can do.


Related Questions

Jessica is thinking of a number that rounds to 1,400 for the nearest ten and for the nearest
hundred. What number might she be thinking of?

Answers

Answer:

1,398

Step-by-step explanation:

i think this is it cause this is very close. Have a nice day.

6) Kate wants to buy some daisies for $6.99, some potting soil for $3.98, and a ceramic pot for $7.95. She has $20.00. Which number sentence represents the amount of change Kate receives back?

Answers

By taking a subtraction, we will see that the change that Kate receives is $1.08

How to get the change?

The change will be given by the difference between what Kate has, and the cost of all the items she buys.

She has $20.00, and the costs are: $6.99, $3.98, and $7.95.

Then the change will be:

C = $20.00 - $6.99 -  $3.98 - $7.95 = $1.08

We conclude that the change is $1.08

If you want to learn more about subtractions, you can read:

https://brainly.com/question/2475734

50 points each question. Please help. How do I solve?

Answers

[tex]~~~~~7e^{xy} +2x^2 -4y^2 =13\\\\\\\implies \dfrac{d}{dx}\left(7e^{xy} +2x^2 -4y^2\right) =\dfrac d{dx} (13)\\\\\\\implies 7\left[e^{xy} \dfrac{d}{dx} ( xy)\right] +2 \cdot 2x -4\cdot 2y \dfrac{dy}{dx} = 0\\\\\\\implies 7e^{xy} \left( x \dfrac{dy}{dx} +y\right) +4x -8y \dfrac{dy}{dx} =0\\\\\\\implies 7xe^{xy}\dfrac{dy}{dx} + 7ye^{xy} +4x -8y\dfrac{dy}{dx} = 0\\\\\\\implies \left(7xe^{xy} -8y \right) \dfrac{dy}{dx}=-7ye^{xy} -4x\\\\\\[/tex]

[tex]\implies \dfrac{dy}{dx} = \dfrac{-7ye^{xy} -4x}{7xe^{xy} -8y }[/tex]

POSSIBLE
Paytin has silk ribbon that is 2 inches wide. She plans to sew the ribbon around the edge of a circular tablecloth that has a 25-inch radius.
How much silk ribbon does she need?
inches of ribbon.
1
2

Answers

Answer:

78.5 or 79 inches when rounded.

Step-by-step explanation:

2 in wide so get half of 2 which is 1 times 3.14 = 3.14. then times that by the 25 inch radius = 78.5

Really need help anybody!?!

Answers

Answer:

it's got to be 3........

1 and 3 are complementary angles

Explanation:
Two angles are called complementary angles when they add up to 90 degrees. In this case you already have a 90 degree angle but need to find the other missing angles that would have to equal 90 degrees. This is bc 90+90 is 180 degrees

|x-20| if x<-20
I need help with the opposite equation

Answers

-(x-20)
Basically it’s the same as your other question but your not adding twenty!

Is 10, 20, 40, 80... an arithmetic sequence?

Answers

Answer:

No.

Step-by-step explanation:

A arithmetic sequence is a sequence of numbers that go up by the same value each time. We can clearly see that this set of numbers does not go up by the same value each time, therefore ruling it out as an arithmetic sequence. This sequence is a geometric sequence in case you're wondering.

Which compound inequality can be represented by the graph below?


x < 5 or x ≥ 9
5 ≤ x < 9
x ≤ 5 or x > 9
5 < x ≤ 9

Answers

Answer:

5 < x ≤ 9

Step-by-step explanation:

Watch help vide
Anna took a taxi from her house to the airport. The taxi company charged a pick-up
fee of $3 plus $2.25 per mile. The total fare was $48, not including the tip. How many
miles was the taxi ride?

Answers

48-3 (take away the fee)
45 divided by 2.25 (to get miles)
The taxi ride was 20 miles

Anna has traveled 20 miles in the taxi.

What is equation?

An equation is a relationship between the variables and constants representing how they are related to each other. It includes equal to "=" sign.

The total amount paid is $48. So, the right side of the equation will be 48.

The cost of 1 mile is $2.25 so, the cost of x miles will be 2.25x.

Determine the total cost in terms of x.

Total cost = Fixed Cost+ Variable cost

= 3+2.25x

Determine the equation and solve it.

3+2.25x=48

2.25x=45

x=20

Thus, the taxi has traveled 20 miles.

To learn more about equations click:

https://brainly.com/question/649785

#SPJ2

What is 34.48 rounded to the
nearest whole number?

Answers

given:

34.48

to find:

34.48 rounded to the nearest whole number.

solution:

= 34

( if the first digit after the decimal point is 5 or more we'll have to round off, if not just keep it as it is. )

The answer is 34 hope this helps

Solve for a side in right triangles. Make sure to round your answer to the nearest hundredth

Answers

Answer:

tan(20) = 4 / x

tan(20)x = 4

x = 4 / tan(20)

x = 10.99 units

Step-by-step explanation:

PLEASE HELP ASAP!!!!!!!!

Answers

Answer:

Minimum = 1
Maximum = 16
Median = 8
First Quartile = 3
Third Quartile = 15
Inter Quartiler Range = 12

Step-by-step explanation:

Looking at the image you provided and the points are given.

what is this its to hard :|

Answers

Answer:

25

Step-by-step explanation:

We take both medians and subtract.

53-28=25

Tina ordered a replacement part for her desk. It was shipped in a box that measures 2 in. by 2 in. by 11 in. What is the greatest length in whole inches that the part could have been?

Answers

Answer:

15 inches

Step-by-step explanation:

The space diagonal of a rectangular prism is the root of the sum of the squares of the edge lengths. The longest straight part that will fit in the box will be at most ...

l = √(4² +4² +14²) = √228 ≈ 15.10 . . . . inches

If im wrong just tell me im sorry if it is

Ally~

Evaluate the expression for the given values.
(a) The expression 5p − 7d evaluated for p = 8 and d = 1/7
(b) The expression 5p − 7d evaluated for p = 3 and d = −6
(a) The expression 5p−7d evaluated for p=8 and d= 1/7 is______ .
Part 2 Of Question
b) The expression 5p − 7d evaluated for p = 3 and d = −6 is ______

Answers

Answer:

a is 39

b is 57

Step-by-step explanation:

you were given two different expressions to substitute.

the first one is p = 8 and d = 1/7

so we substitute into 5p - 7d

that is 5(8) - 7(1/7)

we get 40 - 1

which if we go ahead to evaluate we get 39

The second one p = 3 and d = -6

so we get 5(3) - 7(-6)

we get 15 - (-42)

if we go ahead to evaluate we get 15 + 42

two negative meeting each other gives you positive.

then it going too be 57

What is the answer for 2/3 + 1/4?

Answers

Hey there!


2/3 + 1/4

= 2×4/3×4 + 1×3/4×3

= 8/12 + 3/12

= 8 + 3/12 - 0

= 11/12


Therefore, your answer is: 11/12


Good luck on your assignment & enjoy your day!


~Amphitrite1040:)

Answer:

[tex]\frac{11}{12}[/tex]

Step-by-step explanation:

[tex]\frac{2}{3} +\frac{1}{4}[/tex]
First, find the lowest common denominator (LCD):

3*4=12
Next, convert the fractions to a base of 12.
[tex]\frac{2}{3} * \frac{4}{4} = \frac{8}{12}[/tex]

[tex]\frac{1}{4} * \frac{3}{3} = \frac{3}{12}[/tex]
Then, add our fractions with the same base (12):

[tex]\frac{8}{12} + \frac{3}{12} = \frac{11}{12}[/tex]

help me please i need help​

Answers

Answer:

1/10

3

Step-by-step explanation:

probability of getting a 7 = 1 in 10 =1/10

if the total frequency of spins N= 30

then the expected number of occurrences =N×p=30×(1/10)=3

Answer: a) 1/10

b) 3

Step-by-step explanation:

a) 7 is one number on the spinner meaning that out of 10 possibilities 7 is only one of them which give you 1/10.


b) If she spins it 30 more times this would give you the fraction of 3/30 since it relates to the first fraction.

Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answers

Answer:

Step number 3 is incorrecct

Step-by-step explanation:

It should be 16+12 because when you multiply (4)(3)(-1), which would equal -12, you need to sbutract -12 from 16, which is just adding 12 to 16 since two negatives make a positive.

solve for x ~
[tex]x {}^{2} - 16x = 0[/tex]


thankyou ~​

Answers

Step-by-step explanation:

Mark me brainliest please

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Here we go ~

[tex]\qquad \tt \dashrightarrow \: {x}^{2} - 16x = 0[/tex]

[tex]\qquad \tt \dashrightarrow \: x(x - 16) = 0[/tex]

Now, there are two possibilities ~

[tex]\qquad \tt \dashrightarrow \:x = 0[/tex]

or

[tex]\qquad \tt \dashrightarrow \:x - 16 = 0[/tex]

[tex]\qquad \tt \dashrightarrow \:x = 16[/tex]

I need help it's due tomorrow!!!!​

Answers

Answer:

56

Step-by-step explanation:

All You Need To Do Is Count intill You Reach That Point

Here are the test scores for 15 students in Mr. M's class.
96, 85, 59, 63, 76, 68, 94, 97, 89, 100, 93, 96, 72, 46, 78
What is the percentage of these test scores that are less than 90?

Answers

Answer:

60%

Step-by-step explanation:

If you look through the data, it is clear that 46, 59, 63, 68, 72, 76, 78, 85, and 89 are all less than 90. There are 9 elements total that are less than 90.

For percentages, you take the number you have and divide by the total. Since we know that there are 15 students, we can do 9 / 15. This gives us 0.6 which is 60%

[-32] <,>,= [15] what is the answer

Answers

Answer:

-32 < 15

Step-by-step explanation:

Whenever in the negatives, it's always less than zero. Because 15 is positive, it would be greater than -32.

if X varies inversely as the cube root of y and X=1 when y=8. find y when X =3​

Answers

Answer:

The work is straight forward once you know the formular

The difference between two consecutive cube numbers is always odd or even?

Answers

Answer:

odd

Step-by-step explanation:

take example of 2^3 +3^3 it's odd

now others try yourself

solve
-2(x + 2)(x - 1)​

Answers

Answer:

-2x^2 -2x + 4

Step-by-step explanation:

Distributive prop.

(-2x-4)(x-1)

-2x^2 + 2x - 4x + 4

-2x^2 -2x + 4

What is the square root of a number if it is in ratio form

Answers

The square root of 25 is 5. It is the positive solution of the equation x2 = 25. The number 25 is a perfect square.

...

Square Root of 25 in radical form: √25.

The prism below is made of cubes which measure 1/2 of an inch on one side. What is the volume?
Note: Figure is not drawn to scale.
OA. 15/2 cubic in
OB. 6 cubic in
OC. 30 cubic in
OD. 60 cubic in

Answers

the answer is B.  6 cubic in

A regular hexagon has an area of approximately
20 square centimeters. If the apothem measures
2.4 centimeters, find the approximate length of
each side.

Answers

Answer:

The side is approx 2.78cm

Step-by-step explanation:

There is an area formula for regular polygons that uses the apothem:

A = 1/2•a•s•n

a is the apothem.

s is the side length.

n is the number of sides.

The area, A is given and also the apothem is given, as well as the number of sides.

The shape in your problem is a hexagon, so it has 6 sides.

A = 1/2 asn

20 = 1/2(2.4)s(6)

Multiply.

20 = 7.2s

Divide.

20/7.2 = s

2.78 = s

s = 2.78

|x+20| if x<-20
write the equation without the absolute value signs

Answers

-(x+20)
You take the negative 20 and flip it around!

2. The value of C when y= 2x+C is tangent to the parabola y²=8x is: (a)-1 (b) 1 (c) 2 (d)-2​

Answers

Answer:

B. The value of C is 1

Step-by-step explanation:

Given:

[tex]\displaystyle \large{y=2x+C}\\\displaystyle \large{y^2=8x}[/tex]

y = 2x + C is a tangent to parabola y² = 8x

To find:

value of C

A line being a tangent to curve means both equations are equal but there has to be only one interception between both graphs.

Therefore, substitute y = 2x+C in y² = 8x:

[tex]\displaystyle \large{(2x+C)^2 =8x}[/tex]

Expand the expression (2x+C)² using perfect square:

[tex]\displaystyle \large{4x^2+4xC+C^2=8x}[/tex]

Simplify the equation:

[tex]\displaystyle \large{4x^2+4xC-8x+C^2=0}\\\displaystyle \large{4x^2+(4C-8)x+C^2=0}[/tex]

The discriminant says:

If b²-4ac > 0 then there are two real rootsIf b²-4ac = 0 then there is only one real rootIf b²-4ac < 0 then the are no real roots

For this, we choose b²-4ac = 0 since tangents only have one intersection.

[tex]\displaystyle \large{b^2-4ac = (4C-8)^2-4(4)C^2 = 0}\\\displaystyle \large{16C^2-64C+64-16C^2=0}\\\displaystyle \large{-64C+64=0}[/tex]

Solve the equation for C:

[tex]\displaystyle \large{-64C=-64}\\\displaystyle \large{C=1}[/tex]

Therefore, the value of C is 1

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