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juin [17]
3 years ago
11

Can you help me you can do only a

Mathematics
1 answer:
Dominik [7]3 years ago
5 0
I’m attaching a photo. For each of these, start by multiplying both sides of the inequality by what’s in the denominator.

When drawing of the number lines, the circle is filled in if the any quality has an “equal than.” Otherwise, the circle is left open.

When dividing by a negative number, the direction of the inequality flips. Greater than becomes less than, and vice-versa.

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Black diamond ski resort charges $25 for ski rental and $10 an hour to ski. Bunny hill ski resort charges $50 for ski rentals an
aleksley [76]

Answer:

Five hours at both ski resorts cost the same

Step-by-step explanation:

Let x = hours      Let y = cost

Black Diamonds Ski Resort:  25 + 10x = y

Bunny Hill:  50 + 5x = y

Since the cost should be equal, we can substitute for these two equations.

25 + 10x = 50 + 5x

Solve for x:

x = 5

Check: Plug in for x

Black Diamonds Ski Resort: 25 + 10(5) = 25 + 50 = $75

Bunny Hill: 50 + 5(5) = 50 + 25 = $75

The cost is the same, so we know that five hours has the same cost at both ski resorts.

I hope this is correct! Please mark me as brainliest if this is correct :3

6 0
3 years ago
On a scale drawing a door that is 7 feet tall is drawn 2 inches tall. In this scale, 1 inch is equal to how many feet?
Cloud [144]

Answer:

4.5 ft

Step-by-step explanation:

7/2=4.5

8 0
3 years ago
Read 2 more answers
eu (european union) countries report that 46% of their labor force is female. The United Nations wnats to determine if the perce
Brrunno [24]

Answer:

Step-by-step explanation:

The question is incomplete. The complete question is:

EU (European Union) countries report that 46% of their labor force is female. The United Nations wants to determine if the percentage of females in the U.S. labor force is the same. Based on a sample of 500 employment records, representatives from the United States Department of Labor found that the 95% confidence interval for the proportion of females in the U.S. labor force is 0.357 to 0.443. If the Department of Labor wishes to tighten its interval, they should:

A. increase the confidence level

B. decrease the sample size

C. increase the sample size

D. Both A and B

E. Both A and C

Solution:

Confidence interval for population proportion is written as

Sample proportion ± margin of error

Where sample proportion is the point estimate for the population proportion.

Margin of error = z × √pq/n

The z score for 95% confidence level is 1.96

p = 46/100 = 0.46

q = 1 - p = 1 - 0.46

q = 0.54

n = 500

Margin of error = 1.96√0.46 × 0.54/500 = 0.044

To tighten it's interval, the margin of error needs to be reduced.

If we increase the confidence level, say to 99%, z = 2.58

Then

Margin of error = 2.58√0.46 × 0.54/500 = 0.058

It increased

Also, If we increase the sample size, say to 700, then

Margin of error = 1.96√0.46 × 0.54/700 = 0.037

It has reduced

Therefore, the correct options is

C. increase the sample size

8 0
3 years ago
In this problem, y = c1ex + c2e−x is a two-parameter family of solutions of the second-order de y'' − y = 0. find a solution of
Nonamiya [84]
<span>y(1) = 0 y'(1) = e y" = c1ex + c2e-x y' = c1ex - c2e-x for solving c1, 0 = c1e1 + c2e-1 this implies that c1 = - (c2/e2) and to solve c2 e1 = (-c2e-2)e1 - c2e-1 e1 = (-2c2e-1) c2= - (e1/2e-1) = - (e2/2) c1 = - (c2/e2) = (e2/2e2) Therefore y =(e2/2e2)ex - (e2/2)e-x</span>
3 0
3 years ago
5(3q-1)5q+15 <br><br> Please answer be fast
vodomira [7]

Answer:

15q

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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