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3 years ago

Write a positive or negative integer an increase of $15

Mathematics

1 answer:

slamgirl [31]3 years ago

4 0

Answer:

+15

Step-by-step explanation:

An increase is generally regarded as being positive. If units are dollars, an increase of $15 can be represented by the integer +15.

Additional comment

If units are dimes, then the number would be +150. So, you see, the units are important to know.

It also depends on what is increasing and what is being represented by the integer. If it is an increase in debt, then the change in net worth might be -15.

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The mean annual premium for automobile insurance in the United States is $1,499. Being from Pennsylvania, you believe automobile

timama [110]

Answer:

a) Then, t(s) is in the rejection region. We can not support that the mean annual premium in Pennsylvania is lower than the national mean annual premium

b) The point estimate of the difference is 59 $

Step-by-step explanation:

From sample we get:

sample size n = 25

annual mean x = 1440

standard deviation of the sample s = 150

mean for the mean annual premium μ = 1499

Hypothesis Test:

Null Hypothesis H₀ x = μ

Alternative Hypothesis Hₐ x < μ

Alternative Hypotesis indicates that the test is a one-tail test to the left

Let´s assume confidence Interval 95 % then α = 5 % α = 0.05

As n < 30 and we assume normality we will make a t-student test

degree of freedom df = n - 1 df = 24

With df = 24 and α = 0.05 and from t-student table we get t(c) = - 1.711

To calculate t(s) we apply:

t(s) = ( x - μ ) / s/√n

t(s) = ( 1440 - 1499 ) * 5 / 150

t(s) = - 59/ 30

t(s) = - 1.96

Comparing t(s) and t(c)

|t(s)| > |t(c)|

Then, t(s) is in the rejection region. We can not support that the mean annual premium in Pennsylvania is lower than the national mean annual premium.

b) The point estimate for the difference is : x - μ = 59 $

3 0

3 years ago

If f(x)=3x^2-2 and g(x)=4x+2 what is the value of f+g 2

Papessa [141]

Answer:

Step-by-step explanation:

(f + g)(x) = f(x) + g(x)

f(x) + g(x) = 3x² - 2 + 4x + 2 = 3x² + 4x

Substitute x = 2 into f(x) + g(x)

(f + g)(2) = 3(2)² + 4(2) = (3 × 4) + 8 = 12 + 8 = 20

5 0

3 years ago

A. 3.05 B. 3.6 C. 4 D. 4.06

Karolina [17]

Answer:B

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Dose anyone know how to do these problems

zimovet [89]

Answer:

1. 14

2. 20

3. 12

4. -400

5. 6

6. 21

7. 11

8. 16

9. 40

10. 49

11. 12

12. IDK

Step-by-step explanation:

1. 16-2=14

2. 16+4=20

3. 6 X 2 = 12

4. -400/-10 (negative divided by a negative equals a positive) = 40

5. 6 X 6 = 36

6. 16+5=21

7. 23-12=11

8. 4 X 16 = 64

9. 36-16=20, 20 X 2 = 40

10. 400-8=392, 392/8= 49

11. 912-612=300, 300/25 = 12

12. Sorry too confusing.

4 0

3 years ago

3. Emma said that when you multiply three negative decimals , the product will be positive . Use these numbers to answer the que

mina [271]

Using multiplication signal rules, it is found that:

A: Emma's statement is always false.

B: The result is always negative.

C: Emma's statement is always true.

The rule used for this exercise is as follows:

When two numbers of different signals are multiplied, the result is negative.
When two numbers have the same signal, the result is positive.

Part A:

Three numbers are multiplied, all negative.
The multiplication of the first two result in a positive number.
Then, this positive number is multiplied by a negative number, and the result will be negative, which mean that Emma's statement is always false.

Two examples are:

$-2.5(-3.8)(-2) = 9.5(-2) = -19$

$-2.5(-2)(-0.7) = 5(-0.7) = -3.5$

Part B:

The rule is that the result is always negative.

Part C:

The multiplication of the first two negative numbers result in a positive number.
Then, this positive number is multiplied by another positive number, and the result will be positive, which mean that Emma's statement is always true.

Two examples are:

$-2.5(-3.8)(2) = 9.5(2) = 19$

$-2.5(-2)(0.7) = 5(0.7) = 3.5$

A similar problem is given at brainly.com/question/24764960

5 0

3 years ago