Help me please thank you

Answers

Answer 1

Answer:

Answer:

36 miles

Step-by-step explanation:

If she can drive 12 miles only using 1/3 of a gallon of gas, that means if she uses a full gallon (3/3) she would be driving 36 miles.

12/1 x 1/3

36/1 x 3/3

Multiply the numerators by 3.

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Recent research suggests that depression significantly increases the risk of developing dementia later in life (BBC News, July 6, 2010). In a study involving 949 elderly persons, it was reported that 22% of those who had depression went on to develop dementia, compared to only 17% of those who did not have depression.a. Choose the relevant population and the sample. (You may select more than one answer. Bold the answer(s) that are correct.)i. The sample consists of all elderly people.ii. The sample consists of 949 elderly people.iii. The population is all younger and elderly people.iv. The population is all elderly people.b. Do the numbers 22% and 17% represent the population parameters or the sample statistics? Bold the answer that is correct.i. Population parametersii.Sample Statistics

Answers

Answer:

a. ii. and iv.

b. ii.

Step-by-step explanation:

Hello!

The research study involves elderly persons it was divided into two considering those who suffered depression and those that didn't suffer depression, then the proportion of persons that suffered dementia was counted.

a. Choose the relevant population and the sample.

i. The sample consists of all elderly people.

ii. The sample consists of 949 elderly people.

iii. The population is all younger and elderly people.

iv. The population is all elderly people.

Note: When you determine a population from a text, you NEVER mention a number, even if the population is finite and the total of individuals in it is known. When you determine a sample it always comes with its size.

b. Do the numbers 22% and 17% represent the population parameters or the sample statistics?

i. Population parameters

ii.Sample Statistics

The proportions were determined after taking the sample, as said in the text, first the sample was taken, then the researchers determined from this sample wich elders suffered from depression and which didn't suffer from depression and these two groups, the number of people with dementia was determined. Meaning these are sample values, not population parameters.

I hope it helps!

Reece is setting up a large fish tank. The tank is 1.8metres long and 0.6 metres wide. The water in the tank is 50 cm deep. Reece needs to add a liquid treatment to the water. The instructions tell him to add 5 ml of treatment for every 0.18 m3. How many treatment does Reece need to add?

Answers

Reece needs to add 3 treatments to the fish tank.

How to determine How many treatment does Reece need to add

First, we need to calculate the volume of the fish tank in cubic meters.

Volume = Length × Width × Depth

Volume = 1.8 m × 0.6 m × 0.5 m (converting 50 cm to meters by dividing by 100)

Volume = 0.54 m³

Now, we can calculate how many treatments Reece needs to add using the given ratio of 5 ml per 0.18 m³.

Number of treatments = Volume of tank / Volume per treatment

Number of treatments = 0.54 m³ / 0.18 m³

Number of treatments = 3 treatments

Therefore, Reece needs to add 3 treatments to the fish tank.

Learn more about the volume at brainly.com/question/463363

#SPJ3

Answer:

15 ml

Step-by-step explanation:

Find the volume of the tank which is 1.8m*0.6m*0.5m=0.54m^3

For every 0.18m^3,5ml of treatment is added,what of 0.54m^3

(0.54m^3*5ml)/(0 18m^3)=15ml

Look at this cube, please help

Answers

Let's find the current surface area of the cube.

A = 6a^2

A = 6

Now let's find the surface area of the cube when tripled.

A = 6(3^2)

A = 54

54/6 = 9

So, the answer should be the new surface area will be 9 times the old surface area.

Answer:the new surface will be 9 times the old surface area

Step-by-step explanation:

Πr2/2 for a half circle

Half circle: 1.5 in

Answers

Answer:

3.5 in²

Step-by-step explanation:

Given:

Radius (r) = 1.5 in.

Formula for area of half circle = (πr²)/2

Required:

Area of the half circle

Solution:

Plug in the values into the formula for area of half circle.

Thus:

Area = (π × 1.5²)2

= 7.06858347/2

Area = 3.5 in² (nearest tenth)

Final answer:

The area of a half circle with radius 1.5 inches is calculated using the formula πr2/2, which gives approximately 3.53429 square inches.

Explanation:

The formula given - πr2/2 - is the correct formula for calculating the area of a half circle. In mathematics, the area of a full circle is calculated using the formula πr2. Since a half circle is simply half of a full circle, you just multiply that result by 1/2 (or divide it by 2), hence πr2/2.

The question states the radius (r) is 1.5 inches. To solve for the area of the half circle, you can simply substitute this value into the formula like so: π * (1.5)2 / 2.

First, square the radius: 1.5*1.5 = 2.25. Multiply by π (roughly 3.1416): 2.25 * π = 7.06858. Finally, divide by 2: 7.06858 / 2 = 3.53429 square inches.