Algebra

1.What is the solution of the system?
y=9x-2
y=7x+3
A.(-5/2,41/2)
B.(5/2,41/2)
C.(5/2,-41/2)
D.(-5/2,-41/2)

2.The table below shows the height (in inches) and weight (in pounds)of eight basketball players.

Height=67, 69, 70, 72, 74, 78, 79
Weight=183, 201, 206, 240, 253, 255

what is the correlation of the set of data? Round your answer to the nearest thousandth.
A.-0.946
B.0.596
C.0.035
D.0.981

3.The table below shows the average height of a species of tree (in feet) after a certain number of years.

Years=1, 2, 3, 4, 5, 6, 7, 8
Height=2.1, 3.2, 6.8, 7.3, 11.2, 12.6, 13.4, 15.9

about how tall would you expect one of these trees to be after 22 years?
A.22.31ft
B.35.2ft
C.44.25ft
D.46.2ft

4.You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is 0.984. How confident can you be that your predicted value will be reasonably close to the actual value?

A.I can't be confident at all; this is about as close to a random guess as you can get.

B.I can be a little confident ; it might be close, or it might be way off.

C.I can be very confident; it will be close, but it probably won't be exact.

D.I can be certain that my predicted value will match the actual value exactly.

I think
#1.B
#2.B
#3.C
#4.B
(Please correct me if im wrong)

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  1. #1 ok
    #2 missing a y value
    #3 ok
    #4 C .984 is very close to 1, which is an exact match.

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  2. you use a line of best fit for a set of data to make a prediction about an unknown value. the correlation coefficient for your dataset is -0.015. can you be confident that your predicted value will be reasonably close to the actual value? why or why not ?

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  3. You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is 0.833. How confident can you be that your predicted value will be reasonably close to the actual value?

    please please please help me i need this answer!!

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  4. Please help me!!

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    2. 👎

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