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
dem82 [27]
2 years ago
7

Half of your baseball card collection got wet and was ruined. You bought 14 cards to replace some that were lost. How many did y

ou begin with if you now have 40?
Mathematics
2 answers:
Anon25 [30]2 years ago
4 0
You do the work all the way around, you first subtract 40-14=26
and if half of it was lost then multiply by 2 which is 52.

The answer is 52.
mash [69]2 years ago
3 0

Answer:

Step-by-step explanation:

x+ 14 = 40

x+ 14 -14= 40-14

x = 26

You might be interested in
For which equation is y = 7 a solution?
natali 33 [55]

Answer:

B

Step-by-step explanation:

11+7=18

3 0
2 years ago
Read 2 more answers
The plot shown below describes the relationship between student scores on the first exam in a class and their corresponding scor
STALIN [3.7K]

Answer:

you average the scores by adding scores from exam 1 and exam 2 then divide it by 2 to average the exam scores

Step-by-step explanation:

7 0
3 years ago
5(2x + 4) = 50 (Given) 10x + 20 = 50 (Distributive Property) 10x = 30 (?) x = 3 (Division Property) Fill in the missing reason f
mestny [16]

We go from 10x+20 = 50 to 10x = 30 after we subtract 20 from both sides. So we use the subtraction property (of equality).

Answer: Choice D

6 0
2 years ago
Read 2 more answers
The scientist performs additional analyses and observes that the number of major earthquakes does appear to be decreasing but wo
kifflom [539]

Answer:

Step-by-step explanation:

Hello!

A regression model was determined in order to predict the number of earthquakes above magnitude 7.0 regarding the year.

^Y= 164.67 - 0.07Xi

Y: earthquake above magnitude 7.0

X: year

The researcher wants to test the claim that the regression is statistically significant, i.e. if the year is a good predictor of the number of earthquakes with magnitude above 7.0 If he is correct, you'd expect the slope to be different from zero: β ≠ 0, if the claim is not correct, then the slope will be equal to zero: β = 0

The hypotheses are:

H₀: β = 0

H₁: β ≠ 0

α: 0.05

The statistic for this test is a student's t: t= \frac{b - \beta }{Sb} ~~t_{n-2}

The calculated value is in the regression output t_{H_0}= -3.82

This test is two-tailed, meaning that the rejection region is divided in two and you'll reject the null hypothesis to small values of t or to high values of t, the p-value for this test will also be divided in two.

The p-value is the probability of obtaining a value as extreme as the one calculated under the null hypothesis:

p-value: P(t_{n-2}\leq -3.82) + P(t_{n-2}\geq  3.82)

As you can see to calculate it you need the information of the sample size to determine the degrees of freedom of the distribution.

If you want to use the rejection region approach, the sample size is also needed to determine the critical values.

But since this test is two tailed at α: 0.05 and there was a confidence interval with confidence level 0.95 (which is complementary to the level of significance) you can use it to decide whether to reject the null hypothesis.

Using the CI, the decision rule is as follows:

If the CI includes the "zero", do not reject the null hypothesis.

If the CI doesn't include the "zero", reject the null hypothesis.

The calculated interval for the slope is: [-0.11; -0.04]

As you can see, both limits of the interval are negative and do not include the zero, so the decision is to reject the null hypothesis.

At a 5% significance level, you can conclude that the relationship between the year and the number of earthquakes above magnitude 7.0 is statistically significant.

I hope this helps!

(full output in attachment)

5 0
3 years ago
What is $ 1,000,000 x 0.3=
Marat540 [252]

Answer:

300,000

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the volume of a sphere with a surface area of 9
    12·1 answer
  • Express the area of the entire rectangle.
    9·1 answer
  • K12 10TH GRADE!!!!!!!!!!!!! HAS ANYONE DONE 3.14 Graded Assignment: Congruence and Constructions - Part 2 !!!!!!
    5·1 answer
  • 1 question only (find the area)
    14·1 answer
  • The equation of the circle whose center is at (3, 7) and whose radius is 6 is
    8·1 answer
  • An economic model predicts that the supply, s, and the demand, d, for a new product can be estimated using the
    10·1 answer
  • QUICK HELP ITS DUE IN 10 EEEEEEEEEEE
    8·1 answer
  • PLEASE HELP!!!! WHOEVER GETS IT RIGHT GETS BRAINLIEST !!!!<br><br> FIND THE VALUE OF X
    14·1 answer
  • Help with 5a, to find the values of x​
    15·1 answer
  • Classify the following triangle as acute, obtuse, or right.
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!