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
Leno4ka [110]
3 years ago
11

Look at this expression.

Mathematics
1 answer:
g100num [7]3 years ago
4 0
Multiply x<span> and </span>3

<span>Multiply x and 1</span>

<span>The x just gets copied along.</span>

<span>The answer is x</span>

x

<span>3*x evaluates to 3x</span>

Because of the minus sign

<span>3x becomes - 3x</span>

<span>The answer is -3x</span>

<span>Multiply y and 2</span>

<span>Multiply y and 1</span>

<span>The y just gets copied along.</span>

<span>The answer is y</span>

y

<span>2*y evaluates to 2y</span>

<span>-3*x-2*y evaluates to -3x-2y</span>

<span>The answer is -3x-2y-2</span>

<span>-3*x-2*y-2 evaluates to <span>-3x-2y-2</span></span>

<span><span>so the first one is right</span></span>

<span><span>
</span></span>

You might be interested in
A random sample of 64 second-graders in a certain school district are given a standardized mathematics skills test. The sample m
svet-max [94.6K]

Answer:

Given : The sample mean score is 51.48 .

            The standard deviation for the population of test scores is 15.

             The nationwide average score on this test is 50.

To Find :  Perform the hypothesis test and compute the P-value?

Solution:

Sample size = n = 64

Since n > 30

So, we will use z test over here

We are supposed to find The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average.

Hypothesis : H_0:\mu \leq 50\\H_a:\mu>50

Formula of z test : z =\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}

x = 51.48\\\mu = 50\\\sigma = 15\\ n = 64

Substitute the values

z =\frac{51.48-50}{\frac{15}{\sqrt{64}}}

z =0.789

Find the value of P(z) from z table

p(z)=0.7823

Since we are given that we are supposed to find The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average.

So, p value = 1-P(z)  = 1-0.7823=0.2177

In general , Level of significance is 0.05

So, p value is greater than alpha.

So, we accept the null hypothesis.

5 0
2 years ago
Read 2 more answers
Please help I need it now please and thank you
Bingel [31]

Answer:

It would be the first one or second one

Step-by-step explanation:

the answer is up ahead

5 0
2 years ago
Read 2 more answers
Cristina bought a bag of coffee for $8.47. The weight of the bag was 7/8 of a pound. What was the price, per pound, of the coffe
SpyIntel [72]
~For this problem, you need to divide. 
~The easy way that I think might help you is if you change the fraction into a decimal. 
 
\frac{7}{8} = 0.875
  
Now divide $8.47 by 0.875
\frac{8.47}{0.875} = 9.68
     
     The price per pound of the coffee was $9.68

5 0
3 years ago
Read 2 more answers
If the the area of a bedroom is 90 square feet what is the length and width
Anna [14]
30 x 30........................
6 0
2 years ago
What is the name of the shapes A,B,D
artcher [175]

Answer:

i believe the bottom is a <em>irregular quadrilateral </em>and the first one is a <em>parallelogram </em>

Step-by-step explanation:

4 0
2 years ago
Other questions:
  • OMG PLEASE HELP ME ASAP!!!!!!! A local charity sponsors a 5K race to raise money. It receives $55 per race entry and $10,000 in
    5·1 answer
  • Write a rule for the nth term of the arithmetic sequence. d =1/2 , a6 =18.
    8·1 answer
  • It is twice as far from (3,0) as it is from the y axis
    5·1 answer
  • If point D is translated 6 units right and 4 units up, what are the coordinates of D?
    9·2 answers
  • Find an equation in slope intercept form of a line having slope 6 and y-intercept 2
    10·1 answer
  • HELP ME PLEASE !!!!!!!
    14·2 answers
  • I need help on how to do this
    12·1 answer
  • A team won 5 and lost 2 of their first 7 games. The
    7·1 answer
  • if 4 is subtracted form the half of the square of a natural number, the result is 14, find the numbers​
    7·1 answer
  • Pls help i don’t understand this lolllll
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!