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
just olya [345]
3 years ago
9

-3(-4r - 5) combining like terms

Mathematics
2 answers:
vagabundo [1.1K]3 years ago
6 0

Answer:

12r + 15

Step-by-step explanation:

Just distribute

svp [43]3 years ago
3 0

Answer:

r

=

1

Step-by-step explanation:

You might be interested in
Questions 2-7 will all be in regards to this data set:Observation X Y1 20 302 23 353 28 404 26 385 24 376 32 457 35 508 24 349 3
Tomtit [17]

Answer:

r =0.4437

Step-by-step explanation:

We have the follwoing dataset:

X: 20,23,53,4,24,32,35,24,31,23

Y: 30,35,40,38,37,45,50,34,42,32

n=10

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

And in order to calculate the correlation coefficient we can use this formula:

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}  

For our case we have this:

n=10 \sum x = 269, \sum y = 383, \sum xy = 10609, \sum x^2 =8645, \sum y^2 =15007  

Th excel figure attached shows the calculations for each sum.

r=\frac{10(10609)-(269)(383)}{\sqrt{[10(8645) -(269)^2][10(15007) -(383)^2]}}=0.4437  

So then the correlation coefficient would be r =0.4437

3 0
3 years ago
What is a constant?<br> -a mathematical operator<br> -a variable<br> -a number
lidiya [134]
Ah constant is Ah number
6 0
3 years ago
Read 2 more answers
What is 7 times 0.10 show your work
Vika [28.1K]

Answer:

0.7

Step-by-step explanation:

7 x 0.10

=> 7 x 0.1

=> 7 x 1/10

=> 7/10

=> 0.7

7 0
2 years ago
Read 2 more answers
A jar contains 6 yellow marbles, 4 black marbles, and 2 purple marbles. Two marbles are picked at random, without replacement. W
ludmilkaskok [199]

Answer:

The probability of selecting both yellow is 5/22.

Step-by-step explanation:

Given the number of yellow marbles = 6

Black marbles = 4

Purple marble = 2

Now find the total number of marbles in the jar.

Thus total marbles = Yellow marbles + Black marbles  + Purples marble

Now insert the values in the above formula.

Total marbles = 6 + 4 + 2

Total marbles = 12

The probability of 2 yellow marble:

= \frac{6}{12} \times \frac{5}{11} \\= \frac{5}{22}

Thus, the probability of selecting both yellow is 5/22.

3 0
3 years ago
Find the value of x.<br>x 13 39​
Alex

Answer:

13x-39=39

13x=78

 the answer is x=6

6 0
3 years ago
Other questions:
  • a can of paint will cover 108 square feet. How many cans of paint are needed to paint a wall 6 feet high and 75 feet long?
    15·1 answer
  • A students cost for last semester at her college was 2500. She spent 500 of that on books. What percent of last semesters colleg
    5·2 answers
  • Julian puts 3.5 gallons of gasoline in his tank.If this is 14% of the total volume of his tank how many gallons of gasoline can
    12·1 answer
  • If f(x)=8x+6, what is f(-1)
    14·2 answers
  • How to find the perimeter?
    6·1 answer
  • 1. Consider the following word arrangements:
    13·1 answer
  • What is the Greatest Common Factor (GCF) of 2x^2 and 4x?
    9·1 answer
  • (a) the probability that a vampire bat would pick A (b) the probability that a vampire bat would pick C (c) the probability that
    5·1 answer
  • A label is placed around the juice box below, not including the bases. Determine the surface area of the label.
    8·1 answer
  • Heather and her friends are painting the walls of a storage room in the basement. Each wall is 9 m long and 2 m high. There are
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!