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
Luda [366]
3 years ago
15

Solve each equation: -5(7-8x)-7x=-(3x+1)

Mathematics
1 answer:
7nadin3 [17]3 years ago
7 0

Answer:

Step-by-step explanation:

You might be interested in
To finance a bridge costing $94,500, the state contributed twice as much as the county and the county contributed twice as much
bearhunter [10]
The city contributed $13,500; the county contributed $27,000; and the state contributed $54,000.

Let x be the amount the city contributes.  Since the county contributes twice as much as the city, the county's amount is 2x.  Since the state contributes twice as much as the county, the state's amount is 2(2x) = 4x.

They total 94,500:
x+2x+4x = 94500
7x = 94500

Divide both sides by 7:
x = 13500
2x = 27000
4x = 54000
5 0
3 years ago
A bookstore sells used books for $8 each. Let n represent the number of books. The cost for n books is 8 xn or 8n.
zalisa [80]
The unknown quantity is the books
6 0
3 years ago
F(x)=3x^5-x^3+4x-2 HELPPPPPPPPPPP
Furkat [3]

Answer:

check the attachment

5 0
3 years ago
Are the marks one receives in a course related to the amount of time spent studying the subject? To analyze this mysterious poss
sertanlavr [38]

Answer:

a) 98.522

b) 0.881

c) The correlation coefficient and co-variance shows that there is positive association between marks and study time. The correlation coefficient suggest that there is strong positive association between marks and study time.

Step-by-step explanation:

a.

As the mentioned in the given instruction the co-variance is first computed in excel by using only add/Sum, subtract, multiply, divide functions.

Marks y Time spent x y-ybar x-xbar (y-ybar)(x-xbar)

77                    40 5.1         1.3 6.63

63                     42 -8.9            3.3 -29.37

79                     37 7.1            -1.7 -12.07

86                     47 14.1            8.3 117.03

51                    25 -20.9  -13.7 286.33

78                     44 6.1            5.3 32.33

83                      41 11.1            2.3 25.53

90                     48 18.1            9.3 168.33

65                     35 -6.9           -3.7 25.53

47                    28 -24.9 -10.7 266.43

Covariance=\frac{sum[(y-ybar)(x-xbar)]}{n-1}

Co-variance=886.7/(10-1)

Co-variance=886.7/9

Co-variance=98.5222

The co-variance computed using excel function COVARIANCE.S(B1:B11,A1:A11) where B1:B11 contains Time x column and A1:A11 contains Marks y column. The resulted co-variance is 98.52222.

b)

The correlation coefficient is computed as

Correlation coefficient=r=\frac{sum[(y-ybar)(x-xbar)]}{\sqrt{sum[(x-xbar)]^2sum[(y-ybar)]^2} }

(y-ybar)^2 (x-xbar)^2

26.01        1.69

79.21       10.89

50.41             2.89

198.81       68.89

436.81       187.69

37.21       28.09

123.21        5.29

327.61        86.49

47.61         13.69

620.01         114.49

sum(y-ybar)^2=1946.9

sum(x-xbar)^2=520.1

Correlation coefficient=r=\frac{886.7}{\sqrt{520.1(1946.9)} }

Correlation coefficient=r=\frac{886.7}{\sqrt{1012582.69} }

Correlation coefficient=r=\frac{886.7}{1006.2717 }

Correlation coefficient=r=0.881

The correlation coefficient computed using excel function CORREL(A1:A11,B1:B11) where B1:B11 contains Time x column and A1:A11 contains Marks y column. The resulted correlation coefficient is 0.881.

c)

The correlation coefficient and co-variance shows that there is positive association between marks and study time. The correlation coefficient suggest that there is strong positive association between marks and study time. It means that as the study time increases the marks of student also increases and if the study time decreases the marks of student also decreases.

The excel file is attached on which all the related work is done.

Download xlsx
7 0
3 years ago
SOMEONE PLEASE HELP QUICK ITS TIMED
OleMash [197]

Answer:

true

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • How many milliliters of a 5% bleach solution must be mixed with a 10% bleach solution to produce 900 mL of a 7% bleach solution
    12·1 answer
  • How do you model 604 divided 4 and 796 divided 6 and 449 divided 5
    15·1 answer
  • Clare has $150 in her bank account. She buys a bike for $200 . What is clares account balance now
    15·1 answer
  • AGain, I need help, hehe. I'm awful at maths.
    15·1 answer
  • If f(x)=x^2-5x and g(x)=8-x^3, evaluate the following:
    9·1 answer
  • Solution set is(answer)................
    10·1 answer
  • Given that lines b and c are parallel, select all that apply. Which pairs of angles are supplementary?
    6·2 answers
  • Which of the following correctly uses absolute value to show the distance between -70 and 13?
    11·1 answer
  • Use an area model to multiply (3x+7)(4x+5).
    7·1 answer
  • What si units are used when measuring density
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!