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
den301095 [7]
3 years ago
8

A boy has 11 coins in dimes and quarters. Their value is $1.70. How many of each does he have?

Mathematics
1 answer:
nydimaria [60]3 years ago
3 0

0.10x + 0.25(11 - x) = 1.70

<em>It has the correct values </em>

You might be interested in
For the hypothesis test H0: μ = 10 against H1: μ &gt;10 and variance known, calculate the Pvalue for each of the following test
Basile [38]

Answer:

a) p_v =P(Z>2.05)=1-P(z

b) p_v =P(Z>-1.84)=1-P(z

c) p_v =P(Z>0.4)=1-P(z

Step-by-step explanation:

Some previous concepts

The p-value is the probability of obtaining the observed results of a test, assuming that the null hypothesis is correct.

A z-test for one mean "is a hypothesis test that attempts to make a claim about the population mean(μ)".

The null hypothesis attempts "to show that no variation exists between variables or that a single variable is no different than its mean"

The alternative hypothesis "is the hypothesis used in hypothesis testing that is contrary to the null hypothesis"

Hypothesis

Null hypothesis: \mu=10

Alternative hypothesis: \mu >10

If the random variable is distributed like this: X \sim N(\mu,\sigma)

We assume that the variance is known so the correct test to apply here is the z test to compare means, the statistic is given by the following formula:

z_o=\frac{\bar X -\mu}{\sigma}

Since we have the values for the statistic already calculated we can calculate the p value using the following formulas:

Part a

p_v =P(Z>2.05)=1-P(z

And in order to find the answer using excel we can use the following code:

"=1-NORM.DIST(2.05,0,1,TRUE)"

Part b

p_v =P(Z>-1.84)=1-P(z

And in order to find the answer using excel we can use the following code:

"=1-NORM.DIST(-1.84,0,1,TRUE)"

Part c

p_v =P(Z>0.4)=1-P(z

And in order to find the answer using excel we can use the following code:

"=1-NORM.DIST(0.4,0,1,TRUE)"

Conclusions

If we use a reference value for the significance, let's say \alpha=0.05. For part a the p_v so then we can reject the null hypothesis at this significance level.

For part b the p_v>\alpha so then we FAIL to reject the null hypothesis at this significance level.

For part c the p_v>\alpha so again we FAIL to reject the null hypothesis at this significance level.

3 0
3 years ago
Mr and mrs. Dorsey and their three children are fling to Springfield. The cost of each ticket is $179. Estimate how much the tic
Soloha48 [4]
<span>First figure out how many people there are all together. So mrs and mr is 2 there three children so 2+3=5 so next round 179 to 200 and multiply 200x5. To do that you can use the mental math way witch would be to take the whole number out of 200 and make it 2. Then take the 5 in 200x5 and multiply 2x5. Then add the 2 zeros there were. And your estamated answer would be 1,000.
2+3=5
179=200
200x5
2x5=10
1,000
To figure out your real answer you will have to take 179 and multiply it by 5 so it will look like this:
 34
179
x
   5
895
Soto conculde the answer would be:

Estamated: $1,000

Exact: $895

Hope this helps!</span>
7 0
3 years ago
What are algebra problems nurses use
Paha777 [63]

Answer:linear equations

Step-by-step explanation:

5 0
3 years ago
Find the largest number. 16.3, 15.7, 16.9, 15.8
Oksana_A [137]

Answer:

16.9

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
The science fair judges will be science and volunteers each judge will only have time to view 5 projects there are 133 science t
antiseptic1488 [7]
5 times amount of people has to be bigger than 2112

5(133+v)≥2112
distribute
665+5v≥2112
minus 665 from both sides
5v≥1447
divide both sides by 5
v≥289.4
yo can't have 0.4 volunterer
v≥290

has to have at least 290 volunteers
8 0
3 years ago
Other questions:
  • If f(x)=-2x+7 and g(x)=x^2 -2 find the general rule for f(g(x))
    11·1 answer
  • Maria received $0.42 in exchange after purchasing a pack of gum. what fraction of a dollar did Maria receive in change?
    9·1 answer
  • Im braindead, i dont know.
    9·1 answer
  • I really need help!! can u pwease help ;-;
    12·1 answer
  • John has a part-time job he is praise £6.80 per hour what is his total pay for this week
    6·1 answer
  • What is the answer to this ---&gt;
    15·1 answer
  • She getting up there
    11·2 answers
  • It takes 40 minutes for 8 people to paint 4 walls.
    8·2 answers
  • I will venmo if someone can please help me
    8·1 answer
  • The graph of a function is given. Determine whether the function is increasing, decreasing, or constant on the given interval. (
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!