1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Yakvenalex [24]
2 years ago
7

You improve your time running a course by 5 seconds in week one, by 3 seconds in week two, and by 4 seconds in week three. What

is the mean weekly change in your running time?
Mathematics
1 answer:
wariber [46]2 years ago
3 0

Answer:

\displaystyle \bar x=4\ sec

Step-by-step explanation:

<u>Average Value </u>

The mean or average of a number n of measurements is defined as the sum of all values divided by n.

\displaystyle \bar x=\frac{\sum x_i}{n}

The running times in seconds are being improved by the following numbers:

5, 3, 4

This is the dataset where we have to find the mean value. Here n=3. Applying the formula:

\displaystyle \bar x=\frac{5+4+3}{3}

\displaystyle \bar x=\frac{12}{3}

\displaystyle \bar x=4\ sec

You might be interested in
PLs help
Pavel [41]

A) The hypotenuse is the longest side of the triangle .In the figure EG is the hypotenuse.The given angle is <G=40 degrees.The side adjacent is FG= 10 units.

The question is asking us to find the trigonometry ratio which will  help us find EG.We can use cos  as cos is ratio of adjacent and hypotenuse.

cos 40=\frac{10}{Hypotenuse EG.}

B) Cos  40 =0.766.

Substituting tan40 value we have:

0.766=\frac{10}{EG}

EG=13.05.

C)Sum of angles in  triangle is 180.

<E+<F+<G=180

<E+90+40=180

<E+130=180

<E=50 degrees.

D) Tan  40=\frac{EF}{10}

EF=8.39

E) Area of triangle EFG= \frac{1}{2}x base x height.

A rea of the triangle = \frac{1}{2}x8.39x13.05

Area= 54.75 square units.





5 0
3 years ago
Bill paints murals. He recorded the total amount of white paint that he used for his murals each month in the table below.
kicyunya [14]

Answer:


Step-by-step explanation:

2/3x4/5=8/15

6 0
2 years ago
Read 2 more answers
If the function h is defined by h(x)=<img src="https://tex.z-dn.net/?f=x%5E%7B2%7D" id="TexFormula1" title="x^{2}" alt="x^{2}" a
harkovskaia [24]

Given:

The function is:

h(x)=x^2-3x+5

To find:

The value of h(2x+1).

Solution:

We have,

h(x)=x^2-3x+5

Putting x=2x+1, we get

h(2x+1)=(2x+1)^2-3(2x+1)+5

h(2x+1)=(2x)^2+2(2x)(1)+(1)^2-3(2x)-3(1)+5

h(2x+1)=4x^2+4x+1-6x-3+5

On combining like terms, we get

h(2x+1)=4x^2+(4x-6x)+(1-3+5)

h(2x+1)=4x^2-2x+3

Therefore, the required function is h(2x+1)=4x^2-2x+3.

3 0
3 years ago
Solve the system by substitution.<br> -2x + 7y = 15<br> бу = 3
Salsk061 [2.6K]

Answer:

Step-by-step explanation:

-2x + 7(1/2) =15

-4x +7 =30

-4x =23

x=-23/4

6 0
2 years ago
Point E is between points D and F and DE=27 and EF =34.
asambeis [7]
If e is between them, then the distances DE and EF add to the total, DF. So the answer is just 27 + 34 which is 61, A

4 0
3 years ago
Other questions:
  • The measure of an angle is 68°. what is the measure of a supplementary angle?
    11·1 answer
  • If JKL= MNP, which statement must be true
    12·2 answers
  • The diameters of bearings used in an aircraft landing gear assembly have a standard deviation of ???? = 0.0020 cm. A random samp
    8·2 answers
  • Find the value of a
    9·2 answers
  • Help...1. Simplify 2+17x-5x+9......
    10·1 answer
  • Write a two-column proof
    6·1 answer
  • Help me with this please
    9·1 answer
  • There is also a second step it says
    11·1 answer
  • Use the graph of the parabola to identify the domain and range of the function.
    13·1 answer
  • What complex number is represented by the polar coordinates (4, -pi/4)
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!