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SashulF [63]
3 years ago
11

BRAINLIEST! As a dolphin swims along the side of a cruise ship, he jumps to a height of seven meters above the water surface and

dives to a depth of seven meters below the surface. He does this in a regular motion (simple harmonic motion). A passenger starts a stopwatch just as the dolphin is coming up to the surface. The passenger determines that the dolphin completes one cycle every 6 seconds.
Mathematics
1 answer:
Yuliya22 [10]3 years ago
6 0

PLS! MARK ME AS A BRAILIEST......

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A 2-column table with 6 rows. The first column is labeled miles driven with entries 27, 65, 83, 109, 142, 175. The second column
Helen [10]

Answer:

1) The linear regression model is y = -0.0348·x + 13.989

2) The correlation coefficient is -0.0725

3) The strength of the model is strong - association

Step-by-step explanation:

1)

                         X            Y          XY       X²

                         27            13           351          729

                         65             12          780         4225

                         83              11          913         6889

                         109            10          1090      11881

                         142            9            1278     20164

                         175              8           1400      30625

                ∑      601              63 5812 74513

From y = ax + b, we have

a = \frac{n\sum xy - \sum x\sum y }{n\sum x^{2}-\left (\sum x  \right )^{2}} = \frac{6 \times 5812  - 601 \times 63}{6 \times 74513-601^{2}} = - 0.0348

b = 1/n(∑y -a∑x) = 1/6(63 - (0.0348)×601) = 13.989

Therefore, the linear regression model is y = -0.0348·x + 13.989

2)

r = \frac{n\sum xy - \sum x\sum y }{\sqrt{[n\sum x^{2}-\left (\sum x  \right )^{2}] [n\sum y^{2}-\left (\sum y  \right )^{2}]}}  = \frac{6 \times 5812  - 601 \times 63}{\sqrt{[6 \times 74513-601^{2}] [6  \times 3969 - 63^2]} } = - 0.0725

3) The strength is - association.

5 0
4 years ago
Read 2 more answers
When a number is decreased by 47%, the result is 20. What is the original number
Digiron [165]

Answer:

42.553191489361

3 0
3 years ago
A square has a side length of 9 cm2 what is the area​
const2013 [10]

Answer:

81

Step-by-step explanation:

The definition of a square is a four sided figure that has 2 sets of parallels lines, 4 congruent sides, and 4 right angles.  From that you can tell that one side of the square gives the measurement of all sides of the square.

7 0
3 years ago
What is 360 to 30 in ratio
Pepsi [2]
360 to 30 can be written as 360:30 and call also be written as 360/30

\frac{360}{30} = \frac{36 \times 10}{3 \times 10}= \frac{36}{3} = \frac{12 \times 3}{1 \times 3} = \frac{12}{1}

360 to 30 simplified can be expressed as a ratio like 12:1, 12 to 1, or 12/1


7 0
3 years ago
Read 2 more answers
A bus makes a stop at 2:30, letting off 15 people and letting on 9. The bus makes another stop ten minutes later to let off 4 mo
nika2105 [10]
(-19)+9=-10, so there is 10 less people on the bus

4 0
3 years ago
Read 2 more answers
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