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aivan3 [116]
4 years ago
5

Hurry I'm Timed!!!!The following scatter plot represents the scores of thirteen students on a geography test compared to the num

ber of hours that each student studied for the test. Use the line of best fit to predict the score of a student who studied three hours for the test.
80
85
90
95

Mathematics
2 answers:
Lorico [155]4 years ago
8 0
95 if you look in the middle of the three hrs by 95 u will see I am right
sveta [45]4 years ago
4 0

Answer:

95

Step-by-step explanation:

Going to 3 hours along the x-axis, we go up until we hit the line.

We hit the line between 90 and 100; this is at y = 95.

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lenghts of the sides of a rectangular garden are in a ratio 1:2. Line connecting the centers of the adjacent sides of the garden
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Answer:

perimeter = 107.4 m

area =  640.82 m²

Step-by-step explanation:

The line connecting the the centers of the adjacent sides of the garden is 20 m long. The line is a diagonal that forms an hypotenuse sides of a triangle.

The length of side of the rectangle has a ratio of 1 : 2. This means one side has a length a meters and the other 2a meters.

Pythagoras theorem can be use to get a since a right angle is formed due to the diagonal.

(a/2)² + (2a/2)² = 20²

(a/2)² + (a)² = 20²

a²/4 + a² = 400

(a² + 4a²)/4 = 400

5a²/4 = 400

cross multiply

5a² = 1600

a² = 1600/5

a² = 320

square root both sides

a = √320

a = 17.88854382

a ≈ 17.90  

The required length is a = 17.90 m and the other side will be 17.90 × 2 = 35.80 m.

Area = length × breadth

area = 17.90 × 35.80 = 640.82 m²

perimeter = 2(l + b)

perimeter = 2(35.80 + 17.90)

perimeter = 2(53.7)

perimeter = 107.4 m

8 0
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Step-by-step explanation:

Population density is calculated by : Population / square miles

Therefore :

Population density = 400,000/160

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